Power and Electrical Energy

Power & Electrical Energy

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Multiple Choice

Calculate the electric power of an electrical appliance in which 10 A of current is flowing through a resistor of 2 ohms.
 
Remember: V=IR and P=VI

• 80 W
• 200 W
• 2.5 A
• 22.5 KJ

Multiple Choice

The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?

• 170 W
• 170 A
• 1.7 V
• 1.7 W

Multiple Choice

What will be the current drawn by an electric bulb of 1000 W when it is connected to a source of 220 V?

• 4.55 A
• 28800 J or 28.8 KJ
• 80 W
• 200 W

Multiple Choice

Calculate the voltage applied when a 60 watt light-bulb uses a current of 5 amps

• 300 volts

• 30 volts

• 12 volts

• 0.08 volts

Multiple Choice

The electrical energy used by an air conditioner for 2 minutes is 180 kJ. What is the power of this air conditioner in W ? (Power = Energy / time)

• 1500 W

• 1.5 W

• 90 W

• 90 000 W

Multiple Choice

An electric rice cooker rated 800 W, 230 V is switched on for 30 minutes. How much electrical energy is used by the rice cooker?

• 24 kWh

• 24 000 kWh

• 0.4 kWh

• 400 kWh

Multiple Choice

An electric rice cooker rated 800 W, 230 V is switched on for 30 minutes. What is the cost of energy that is used by the rice cooker if the cost per kWh is 30 cent?

• $ 12 000.00

• $ 120.00

• $ 12.00

• $ 0.12