Question 1 How many electrons pass a fixed point in a 100-watt light bulb in 1 hour if the applied constant voltage is 120 V? Question 2 The average current in a typical lightning thunderbolt is 2 x 10* A and its typical duration is 0.1 s (Williams, 1988). The voltage between the clouds and the ground is 5 x 10° V. Determine the total charge transmitted to the earth and the energy released. (Reference: Williams, E. R. 'The Electrification of Thunderstorms', Scientific American, Nov. 1988. pp. 88 – 89.) Question 3 A unit of power used for electric motors is the horsepower (hp), equal to 746 watts. How much energy does a 5-hp motor deliver in 2 hours? Express the answer in MJ.

EBK ELECTRICAL WIRING RESIDENTIAL
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Chapter6: Ground-fault Circuit Interrupters, Arc-fault Circuit Interrupters, Surge Protective Devices, Immersion Detection Circuit Interrupters, And Appliance Leakage Current Interrupters
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Question 1
How many electrons pass a fixed point in a 100-watt light bulb in 1 hour if the applied constant voltage is 120 V?
Question 2
The average current in a typical lightning thunderbolt is 2 × 10* A and its typical duration is 0.1 s (Williams, 1988). The
voltage between the clouds and the ground is 5 x 108 V. Determine the total charge transmitted to the earth and the
energy released.
(Reference: Williams, E. R. 'The Electrification of Thunderstorms', Scientific American, Nov. 1988. pp. 88 – 89.)
Question 3
A unit of power used for electric motors is the horsepower (hp), equal to 746 watts. How much energy does a 5-hp motor
deliver in 2 hours? Express the answer in MJ.
Question 4
A conductor has a constant current of 5 amperes. How many electrons pass a fixed point on the conductor in 1 minute?
Question 5
A certain circuit element has the current and voltage as follows:
i = 10e-5000t A
v = 50(1 – e-5000Ł) V
Find the total energy transferred during t 2 Os.
Question 6
The voltage and current at the terminals of an automobile battery during a charge cycle are shown in Figure 1. Based on
that figure:
(i)
Calculate the total charge transferred to the battery.
(ii)
Calculate the total energy transferred to the battery.
Transcribed Image Text:Question 1 How many electrons pass a fixed point in a 100-watt light bulb in 1 hour if the applied constant voltage is 120 V? Question 2 The average current in a typical lightning thunderbolt is 2 × 10* A and its typical duration is 0.1 s (Williams, 1988). The voltage between the clouds and the ground is 5 x 108 V. Determine the total charge transmitted to the earth and the energy released. (Reference: Williams, E. R. 'The Electrification of Thunderstorms', Scientific American, Nov. 1988. pp. 88 – 89.) Question 3 A unit of power used for electric motors is the horsepower (hp), equal to 746 watts. How much energy does a 5-hp motor deliver in 2 hours? Express the answer in MJ. Question 4 A conductor has a constant current of 5 amperes. How many electrons pass a fixed point on the conductor in 1 minute? Question 5 A certain circuit element has the current and voltage as follows: i = 10e-5000t A v = 50(1 – e-5000Ł) V Find the total energy transferred during t 2 Os. Question 6 The voltage and current at the terminals of an automobile battery during a charge cycle are shown in Figure 1. Based on that figure: (i) Calculate the total charge transferred to the battery. (ii) Calculate the total energy transferred to the battery.
v (V)
12
9
t (ks)
i (A)
15-
10
t (ks)
12
15
Figure 1
Question 7
The voltage and current at the terminals of an electrical circuit element is given by:
v = t(1 – 0.025t), 0 < t < 40s;
i = 4 – 0.2t A,0 <t < 40s
Find:
(i)
At what time is the power being delivered to the circuit element maximum?
What is the maximum power delivered?
At what time is the power being extracted from the circuit element maximum?
(iv)
What is the maximum power being extracted?
15
Transcribed Image Text:v (V) 12 9 t (ks) i (A) 15- 10 t (ks) 12 15 Figure 1 Question 7 The voltage and current at the terminals of an electrical circuit element is given by: v = t(1 – 0.025t), 0 < t < 40s; i = 4 – 0.2t A,0 <t < 40s Find: (i) At what time is the power being delivered to the circuit element maximum? What is the maximum power delivered? At what time is the power being extracted from the circuit element maximum? (iv) What is the maximum power being extracted? 15
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