DELMAR'S STANDARD TEXT OF ELECTRICITY
6th Edition
ISBN: 9780357323380
Author: Herman
Publisher: CENGAGE C
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Textbook Question
Chapter 10, Problem 5PP
A digital voltmeter indicates a voltage of 2.5 V when 10
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Voltmeter can measure
DC current
a.
O b. only DC voltage
Oc only AC voltage
both DC and AC voltage
d.
The convention for voltmeters is to use a black wire for the negative reference terminal and a red wire for the positive reference terminal.
Explain why two wires are required to measure a voltage.
If the wires into the voltmeter are swapped by accident, what will happen during the next measurement?
Design a multirange d.c. milliammeter with a basic meter having a resistance 75 ohm and full scale deflection for the current of 2 mA. The required ranges are 0-10 mA, 0-50 mA and 0-100 mA ??
Chapter 10 Solutions
DELMAR'S STANDARD TEXT OF ELECTRICITY
Ch. 10 - To what is the turning force of a dArsonval meter...Ch. 10 - Prob. 2RQCh. 10 - A DC voltmeter has a resistance of 20,000 per...Ch. 10 - 4. What is the purpose of an ammeter shunt?
Ch. 10 - 5. Name two methods used to make a DC multirange...Ch. 10 - 6. How is an ammeter connected into a circuit?
Ch. 10 - 7. How is a voltmeter connected into a circuit?
Ch. 10 - 8. An ammeter shunt has a voltage drop of 50 mV...Ch. 10 - 9. What type of meter contains its own separate...Ch. 10 - 10. What electrical quantity does the oscilloscope...
Ch. 10 - 11. What is measured on the Y axis of an...Ch. 10 - 12. What is measured on the X axis of an...Ch. 10 - 13. A waveform shown on the display of an...Ch. 10 - 14. What is the major difference between a...Ch. 10 - 15. What two factors determine the turning force...Ch. 10 - You are an electrician on the job. You have been...Ch. 10 - 1. A d'Arsonval meter movement has a full-scale...Ch. 10 - The meter movement described in Question 1 is to...Ch. 10 - 3. A meter movement has a full-scale value of . A...Ch. 10 - The meter movement described in Question 1 is to...Ch. 10 - 5. A digital voltmeter indicates a voltage of 2.5...
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- What is the difference between an ammeter and a voltmeter? How they are connected in a circuit (draw circuit diagram)?arrow_forwardA 150 V moving iron voltmeter of accuracy class 1.0 reads 75 V when used in a circuit under standard conditions. The maximum possible percentage error in the reading is ?arrow_forwardHow does a voltmeter differ from a potentiometer? What type of meter is the Corning-10 pH meter?arrow_forward
- A DC voltmeter has a sensitivity of 1000 ohm/volt. When it measures half of full scale in 100 V range, the current through the voltmeter is ??arrow_forwardFour cells each of 2.10 volt internal emf are parallel connected together to make a battery. The internal resistances are 0.004, 0.005, 0.003 and 0.0025 ohm. Calculate for parallel connections: (a) internal emf and resistance of the single equivalent cell (b) current for a terminal voltage of 1.95 volts, (c)current in each cellarrow_forwardIf the measured values for resistors #1, #2 and # 3 are 552, 549 and 549 Ohms calculate the %error (measured difference from expected value as a percentage) for each resistor. Are they within tolerance (or specification) of manufacturer? #1 98.4% #2 97.9% #3 97.9% Yes within specification a. b. #1 1.6% #2 2.1% #3 2.1% Yes within specification #1 1.6% #2 2.1% #3 2.1% No outside specification Ос. Use Ohm's Law to calculate the equivalent resistance of R12, R23 and R123 (as specified in the lab manual) using measured resistances #1 552 Ohms, #2 549 Ohms, #3 549 Ohms R, R2 R,= R12 R23arrow_forward
- A 50 μA basic D'Arsonval movement with an internal resistance of 500 is to be used as a voltmeter. The value of the multiplier resistance required to measure a full-scale voltage range of 0-5 volts is?arrow_forwardIm not sure how to apply KCL herearrow_forward14. A 6-V lead-acid battery has an A-hr rating of 180 A-hr. The battery is to be load-tested. What should be the test current, and what are the maximum permissible amount and duration of the voltage drop?arrow_forward
- What is the effect of decrease in voltage at constant resistance on a current according to ohms lawarrow_forwardIf a potential difference of 2.15 volts is applied to an unknown resistance and the measured current is in milliamps, what is the expected error in the following cases 1) when measuring the potential difference 2) when measuring the current 3) when calculating the resistancearrow_forwardShow how to calculate the current flow and voltage drop across each device (R, L, C).arrow_forward
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