Electrical Power Calculations

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?

Tags

NGSS.HS-PS3-5

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?

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)

A clothes dryer in a home has a power of 4,500 watts and runs on a special 220-volt household circuit. What is the current through the dryer? (Answer to 2 decimal places)

What is the resistance of a 60 watt light bulb operated at 120 volts?

How much voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms of resistance?

Tags

NGSS.HS-PS3-5

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?

A toaster produces 55 W of power and draws a current of 10 A. What voltage must be applied to run the toaster?