Power and Electrical Energy

If an oven has a power of 2000 W and the voltage is 200 V what is the best fuse is required?

• 3A

• 5A

• 10A

• 15A

A water heater states 220 V / 5A. If it is used for 1 hour, find the total electrical energy needed for this process? (1 KJ = 1000 J)

• 1.1 KJ

• 66 KJ

• 1 584 KJ

• 3960 KJ

The electric stove converts the electrical energy into ____________ energy.

• chemical

• heat

• light

Electrical power can be calculated using

• Resistance x Voltage
• Voltage x Current 
• Voltage ÷ Current

Watts is the same as...

• Joules per second
• Voltage per second
• Current per second

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

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

A lamp changes __________ energy into light energy.

• Kinetic
• Electrical
• Sound
• Chemical

A current of 4 A flows through a 20 V car headlight bulb. Calculate the electric power.
 
Remember: I=P/V

• 80 W
• 200 W
• 2.5 A
• 4.55 A