Electrical Power

An appliance that uses 2 kW is run for 3 hours, using a total of 6 kWh. If a second appliance uses 0.5 kW, how many hours must it be run to use the same total amount of electrical energy?

• 2 hours

• 6 hours

• 9 hours

• 12 hours

Tags

NGSS.HS-PS3-1

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

pair of 15-watt computer speakers 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 it is known that an object has a power of 500 W in 30 minutes. How much electrical energy is in Kwh?

Tags

NGSS.HS-PS3-1

120 V What is the amperage?

• 10 Amps

• 12 Amps

• 10 Watts

• 12 Ohms

How much does it cost to light 6 100 W light bulbs for 6 hours if the price of electrical energy is $0.09/kWh?

• $4.00

• $6.24

• $3.24

• $5.24

Tags

NGSS.HS-PS3-1

A device has a resistance of 10 ohms and a current of 2 amps. What is the power consumed by the device?

• 40 watts

• 80 watts

• 20 watts

• 5 watts

A circuit has a voltage of 12 volts and a current of 3 amps. What is the power delivered by the circuit?

• 24 watts

• 9 watts

• 15 watts

• 36 watts

A device has a power rating of 100 watts and operates at a voltage of 120 volts. What is the current consumed by the device?

• 1.2 amps

• 10 amps

• 50 amps

• 0.8333 amps

In a series circuit, if the total resistance is 20 ohms and the current is 5 amps, what is the power dissipated by the circuit?

• 1000 watts

• 500 watts

• 250 watts

• 100 watts