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Name: _______________________________________________________________Date: _________________________Block:___
Calculating Power, Energy & Cost
For the problems below, be sure to show ALL your work
including the formula and final units.
1.
A 6-volt battery produces a current of 0.5 amps. What is the
power
in the circuit?
2.
A 100-watt light bulb is operating on 1.2 amperes of current. What is the
voltage
?
3.
A potential difference of 120 volts is operating on a 500-watt microwave oven. What is the
current
being used?
4.
A light bulb uses 0.625 amperes from a source of 120 volts. How much
power
is used by the bulb?
5.
What
voltage
is necessary to run a 500-watt motor with a current of 200 amperes?
For each of the next 3 Problems (#6 – 9), calculate the amount of energy used in both kilowatt-
hours (kWh) and Joules (J).
6.
A 3000-watt water heater operating for 30 minutes.
7.
A 1000-watt iron left on for 3 hours.
8.
A 30-watt flashlight left on for 15 minutes.
9.
What is the advantage of using kWh over J as a unit of measurement?
Mrs. N Gill
Science 9
Name: _______________________________________________________________Date: _________________________Block:___
10. A microwave oven operates on 5 amps of current on a 110-volt circuit for one hour. Calculate the
total
kilowatt-hours
used.
11. How much would it
cost
to run the microwave in Problem 10 if the cost of energy is $0.10 per
kWh?
12. A refrigerator operates on 15 amps of current on a 220-volt circuit for 18 hours per day. How many
kilowatt-hours
are used per day?
13. If the electricity costs are $0.15 per kWh, how much does it
cost
to run the refrigerator in Problem
12 per day?
14. The meter reading on June 1 was 84502 kWh. On July 1, the meter read 87498 kWh. If the cost of
electricity in the area was $0.12 per kWh, what was the
electric bill
for the month of June?
15. A room was lighted with three 100-watt bulbs for 5 hours per day. If the cost of electricity was
$0.09 per kWh, how much would be
saved
per day by switching to 60-watt bulbs?
Mrs. N Gill
Science 9
Answers
:
0.55 kWh
59.4 kWh
83.3 V
3 W
5.4¢
$8.91
5400000J
5.5¢
$359.52
4.2 A
1.5 kWh
3 kWh
75 W
10800000 J
0.0075 kWh
2.5 V
27000 J
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Related Questions
Calculate the assigned values in the circuits below.
E2 = ________ E3 = _________ E6 = _________ E9 = _________
E11 = ________ E13 = _________ RT = ________ R6 = __________
IT = _________ I5 = __________ I7 = _________ I10 = __________
PT = ________
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KVLLoop abfea: __________________________________________________Loop cdhgc: __________________________________________________Loop bcgfb: ___________________________________________________
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Answer each problem and show your solutions cleanly and clearly. Draw diagrams.__________________________________________________________________________________________________________
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Electrical Engineering
Give correct answer
UPSs measured in ____________ and ______________. __________________ are what your system uses and ____________________________ are what UPS can deliver in a perfect world.
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___________ is an Area on a device characteristic where the ratio between applied voltage and resulting current is constant.
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6.a. Extreme _______ may cause some nonmetallic conduits to become brittle and therefore moresusceptible to damage from physical contact.A. coldB. corrosionC. voltageD. heat6.b. Snap switches are permitted to be grouped or ganged in an enclosure provided the voltage between theadjacent snap switches does not exceed ___ V.A. 400B. 300C. 200D. 100
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Determine the current, voltage and power dissipated by each of the 6 resisters in the following circuit:
R47: V:_______ I:_______ P:_______
R16: V:_______ I:_______ P:_______
R5: V:_______ I:_______ P:_______
R40: V:_______ I:_______ P:_______
R22: V:_______ I:_______ P:_______
R2 : V:_______ I:_______ P:_______
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6. Ferrous metal raceways or enclosures are made with _______ content.A. brass or aluminumB. steel or brassC. aluminum or ironD. iron or steel
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NUMBER SYSTEM ADDITION
10111 BASE 2 + FEED BASE 16 + 321 BASE 8 = ____________ BASE 8
1020 BASE 10 + 101111 BASE 2 + 212 BASE 8 = ___________BASE 16
F12 BASE 16 + FAAA BASE 16 + CDA BASE 16 = ____________BASE 8
1011 BASE 2 + 1011 BASE 2 + 1101 BASE 2 + A BASE 16=_______BASE 10
444 BASE 8 + 222 BASE 8 + 101 BASE 8 + F BASE 16 = ________BASE 16
101101 BASE 2 + 1110101 BASE 2 + 11101 BASE 2 + 0101 BASE 2= _______BASE 2
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Part 2: Analysis and selection of the Wind Turbine. The team decides at install a 30 MW wind farm. The turbine that has been selected by the local contractor is an Enercon wind turbine. The specifications of all the available Enercon wind turbine is shown in the attached datasheet.
1. Decide on the required number of wind turbines needed. 2. In your own words, explain what the Betz limit for wind turbines means.
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A device used in kitchen serving hotels dining rooms club houses and restaurants is__________.
a.) Grease basin b.) Yard basin c.) Garage basin d.) Oil catch basin
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Potential energy, or voltage, introduced into a circuit is called a(n) ____________________.
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Answer the following:
A) Type of clipper circuit per level of clipping.
1. ___________
2. ___________
3. ___________
B) Type of clipper circuit per non-linear devices used.
1. ___________
2. ___________
C) Other term for clipper circuit.
1. ___________
2. ___________
3. ___________
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1.1 PV modules can be wired together in an array using ______ connections to increase voltage.
a. Terminating
b. Series
c. Parallel
d. AC
1.2 A PV module, also called a solar panel, is comprised of individual photovoltaic _______ wired and mounted together as an integrated unit.
a. Capsules
b. Compartments
c. Chips
d. Cells
1.3 A __________ system uses a storage system that stores the generated electricity so it can provide during times when the system’s panels are not receiving solar energy.
a. Direct coupled
b. Self regulating
c. Charge controlled
d. Indirectly connected
1. 4 __________ energy may have the potential to supply all of the world's energy needs, but at this time, it provides a very small percentage.
a. Coal
b. Natural Gas
c. Diesel
d. Solar
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14: In a natural circulation solar water heater, collector has a glass cover on the top and an ________________ material at the bottom.
a.
Insulating
b.
Sheets
c.
Steel
d.
Tubes
15: text
____________ wind mill consists of narrow rims and wire spokes.
a.
Single bladed
b.
Vertical Axis
c.
Double bladed
d.
Multibladed
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13. If an equipment bonding jumper is run external to a raceway, it must be less than _______ feet.A. 6B. 2C. 4D. 5
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On site plans, all evevations are referenced from_.
A. The centerline of a street B. Ground level C. A bench mark D. A test boring
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Find the value of unknown.
2:5 —___:15
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Raceway fill calculations are a prerequisite in ____ needed for particular circuits.
Select one:
A. MATERIAL REQUIREMENTS
B. SCHEMATIC REQUIREMENTS
C. DETERMINING THE SIZE OF RACEWAY
D. CIRCUIT LOADS
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Question 9
An FET is a
current
voltage
O voltage and current
__-controlled device.
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Electrical plants
Define the terms "Main column ." " Line ." " Protection earth " and "
Operating earth
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QUESTION 9
When a ground wire is connected to an interior gas piping system and the underground portion of the gas pipe into the building is plastic, which of the following is (or are) true?
a
A.This would be approved by code as the gas pipe is only being bonded to the electrical system.
b
B.This installation would be approved by code, as the gas pipe is not a grounding electrode.
c
C.Both A and B
d
D.Neither A nor B
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Trouble shooting is the systematic _____________________________ of the various ______________ of a system or process to _________________ a __________________________________ part.
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Suppose the current in this circuit is I = -35 A. The voltage drop across each circuit element is as given in the table below. From this information, determine, for each of these circuit elements,
(i) whether an active or passive sign convention is being used for that element,
(ii) whether that element is absorbing or producing a net (positive) amount of electrical power.
In each answer box within the table below, type the correct choice from among the bold-faced words above.
-
A
A
B
C
A
+
с
B
+ V₂
Circuit element Voltage drop Sign convention? Absorbing or producing net electrical power?
-5 V
-6 V
1 V
-
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In the generation of electricity, generating too little electricity will cause __________ and generating too much electricity will cause__________________
a. Blackout and brownout
b. Brownout and blackout
c. Lights on and lights out
d. Lights out and lights on
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1. A14/2 type copper used for a general lighting branch circuit. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 2.Three 8 AWG copper conductors with THHN insulation Installed in garage in electrical metallic tubing (EMT). The ambient temperature in the garage can reach as high as 110'F. All termination points for this circuit are rated 60'C. Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 3.Four 4 AWG copper conductor with THWN insulation imstalled in EMT in a basement. All termination points are rated at 60'C.
Ampacity:______________ Maximum Fuse or Circuit Breakers Sizes:________________ 4. An 8/3 Type UF copper cable installed underground from a house to a detached garage to feed a 120/240-volt subpanel. All termination points are rated at 60'C.…
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illuminated in the conference hall. Luminaire providing semi-indirect lighting will be
used. The ceiling and walls are white. Lighting will be provided with 36W
fluorescent fixture ( GE brand daylight fluorescent bulb). Determine the number of
fixtures to be used and draw the shape of the ceiling layout?
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Related Questions
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- Determine the current, voltage and power dissipated by each of the 6 resisters in the following circuit: R47: V:_______ I:_______ P:_______ R16: V:_______ I:_______ P:_______ R5: V:_______ I:_______ P:_______ R40: V:_______ I:_______ P:_______ R22: V:_______ I:_______ P:_______ R2 : V:_______ I:_______ P:_______arrow_forward6. Ferrous metal raceways or enclosures are made with _______ content.A. brass or aluminumB. steel or brassC. aluminum or ironD. iron or steelarrow_forwardNUMBER SYSTEM ADDITION 10111 BASE 2 + FEED BASE 16 + 321 BASE 8 = ____________ BASE 8 1020 BASE 10 + 101111 BASE 2 + 212 BASE 8 = ___________BASE 16 F12 BASE 16 + FAAA BASE 16 + CDA BASE 16 = ____________BASE 8 1011 BASE 2 + 1011 BASE 2 + 1101 BASE 2 + A BASE 16=_______BASE 10 444 BASE 8 + 222 BASE 8 + 101 BASE 8 + F BASE 16 = ________BASE 16 101101 BASE 2 + 1110101 BASE 2 + 11101 BASE 2 + 0101 BASE 2= _______BASE 2arrow_forward
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SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- EBK ELECTRICAL WIRING RESIDENTIALElectrical EngineeringISBN:9781337516549Author:SimmonsPublisher:CENGAGE LEARNING - CONSIGNMENT
EBK ELECTRICAL WIRING RESIDENTIAL
Electrical Engineering
ISBN:9781337516549
Author:Simmons
Publisher:CENGAGE LEARNING - CONSIGNMENT