Electric Power

A heater produces a current of 5 A when plugged into a socket that provides 40 V. What is the power used by the heater?

An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. What amount of power is used by the alarm clock?

A subwoofer needs a household voltage of 110 V to push a current of 5.5 A through its coil. What is the power used by the subwoofer?

If a toaster produces 12 watts of power in a 120-volt circuit, what is the amount of current in the circuit?

A unit of electrical power is the

• a) ohm

• b) volt

• c) watt

• d) amp

Electrical power can be calculated using

• Resistance x Voltage

• Voltage x Current 

• Voltage ÷ Current

What is the unit of power in electrical systems?

• Joule

• Watt

• Volt

• Ampere

 A 120 Vac - 20 A  circuit breaker max power rating

• 240 watts

• 24 watts

• 2400 watts

• 240 volts

An electric heater works by passing a current of 50 A though a coiled metal wire, making it red hot, and uses 120 W of power. What voltage must be applied to run the heater?

What current flows through a hair dryer plugged into a 12 Volt circuit if it uses 25 W of power? (Round to 2 decimal places)