Electric Power

If the hair dryer and the vacuum cleaner are both on, what is the power used?

• 2600 watts
• 400 watts
• 2200 watts
• 1100 watts

The power of an appliance is...

• the amount of voltage going through it 
• the amount of energy transferred per second
• the amount of charge that passes through per second

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

What will be the current drawn by an electric bulb of 1000 W when it is connected to a source of 220 V?
Remember: I = P/V

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

A pair computer speakers use 15 watts of power total and are connected to a 12-volt power supply. What is the electric current running through the speakers?

• 1.25 A

• 0.8 A

• 12.5 A

• 180 A

If an oven has a power of 2000 W and the voltage is 230 V what fuse is required?

• 3 A

• 5 A

• 8.7 A