
Electrical Power Calculations
Quiz
•
Physics
•
Vocational training
•
Practice Problem
•
Medium
Steve Butcher
Used 4+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
The voltage drop in a cable carrying 10.5 amperes is 4.6 volts. Calculate the power wasted in the cable.
49.2 watts
48.6 watts
48.9 watts
48.3 watts
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
A d.c. machine takes 18.6 amperes from a 220-volt supply. Calculate the machine’s input power.
4092 watts
4080 watts
4100 watts
4075 watts
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Calculate the voltage drop in a resistor, when the power absorbed is 9kW and the current flowing is 63 amperes.
160 V
150 V
142.86 V
170 V
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
An appliance is rated at 3kW 240 volts. Calculate the current drawn from the supply.
10 A
12.5 A
15 A
20 A
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Two resistors of 25Ω and 95Ω are connected in series across a 240 volt dc supply. What is the total power drawn from the supply?
480 W
600 W
720 W
960 W
6.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
What is the value of the resistor that absorbs 1kW of power when a current of 10 amperes is flowing?
1 ohms
100 ohms
10 ohms
0.1 ohms
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
A joint in a cable has a resistance of 0.0236Ω. Calculate the power developed in the joint when a current of 40 amperes is flowing in the cable.
37.76 W
38.24 W
37.44 W
36.96 W
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