Calculating Electrical Energy and Cost

A space heater plugged into a 120 V outlet carries a current of 12.5 amps. The heater is run for 4 hours. How much energy is used by this heater?

• 6000 kWh

• 6 kWh

• 38.4 kWh

• 2.4 kWh

A hair dryer with 8Ω of resistance is on a 120V circuit and is used for 15min. How much energy is used?

• 27 kWh

• 1800 kWh

• 450 kWh

• 0.45 kWh

The meter reading at a home on the first of May is 46831. The meter reading at the same home on the first of June is 48423. How much did the monthly energy cost if the price per kWh is 0.07263.

• $1592.00

• $159.20

• $115.63

• $3.40

How much does it cost to operate a TV for a month if the TV uses 110 V in a 0.33 amp circuit and is operated for 6 hours a day. The cost per kWH is $0.08112

• $530.04

• $4.87

• $0.02

• $0.53

How much energy did a restaurant use if the meter reading was 234572 on July 1st and was then 251172 on August 1st

• 16600 kWh

• 1.07 kWh

• 485744 kWh

• 58917918380 kWh

If you have 26 light bulbs in your home, each 60 watts, how much does it cost to operate them, on average, for 2.5 hours a day, for a month? The cost of electrical energy from the utility company is $0.100496.

• $391.93

• $11,578.03

• $15.07

• $11.75