Electric Power Problems In Physics -Multiple Choice Questions Quiz

Question 1: The unit of electric power is:

(a) Joule
(b) Watt
(c) Ohm
(d) Volt

Question 2: A device consumes 500 watts of power when operated at a voltage of 100 volts. What is the current flowing through the device?

(a) 2.5 amperes
(b) 5 amperes
(c) 10 amperes
(d) 50 amperes

Question 3: A 200-watt light bulb is connected to a 120-volt power source. What is the resistance of the light bulb?

(a) 0.6 ohms
(b) 6 ohms
(c) 60 ohms
(d) 600 ohms

Question 4: An electric heater draws a current of 5 amperes when connected to a 240-volt power source. What is the power consumed by the heater?

(a) 240 watts
(b) 300 watts
(c) 1200 watts
(d) 12000 watts

Question 5: A motor operates at 220 volts and draws a current of 10 amperes. What is the power consumed by the motor?

(a) 22 watts
(b) 220 watts
(c) 440 watts
(d) 2200 watts

Question 6: A 60-watt bulb is connected to a 120-volt power source. What is the resistance of the bulb?

(a) 2 ohms
(b) 40 ohms
(c) 120 ohms
(d) 180 ohms

Question 7: A hairdryer draws a current of 8 amperes when connected to a 240-volt power source. What is the power consumed by the hairdryer?

(a) 240 watts
(b) 800 watts
(c) 1920 watts
(d) 3072 watts

Question 8: A toaster draws a current of 12 amperes when connected to a 120-volt power source. What is the power consumed by the toaster?

(a) 12 watts
(b) 120 watts
(c) 240 watts
(d) 1440 watts

Question 9: A circuit is connected to a 12-volt power source and draws a current of 3 amperes. What is the power consumed by the circuit?

(a) 9 watts
(b) 15 watts
(c) 36 watts
(d) 48 watts

Question 10: A lamp operates at 110 volts and draws a current of 2 amperes. What is the power consumed by the lamp?

(a) 22 watts
(b) 55 watts
(c) 220 watts
(d) 242 watts

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Answer key:

Question 1: b

Question 2: a

Question 3: c

Question 4: c

Question 5: d

Question 6: b

Question 7: c

Question 8: d

Question 9: c

Question 10: c