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# Measuring Electrical Energy - PowerPoint PPT Presentation

Measuring Electrical Energy. Lesson 11. Measuring Electrical Energy. What is Energy? Energy - The ability to do work Electrical Energy - The energy transferred to an electrical load by moving charges.

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### Measuring Electrical Energy

Lesson 11

What is Energy?

• Energy- The ability to do work

• Electrical Energy- The energy transferred to an electrical load by moving charges.

• Circuit 1 has two 1.5 volt batteries in series producing a total of 3.0 volts. The circuit can keep the bulb lit for 5 hours.

• It is using more energy.

• We can use a formula to calculate the amount of energy used in household appliances.

• Energy = Power x Time

• kWh kW h

• Total Energy Used = Speed That Electricity is used x How long electricity is used

• Examples :

• How many kilowatt hours of electrical energy are used by a kettle that has a power rating of 1.5kW and is operated for 1.0 hours?

• Energy = Power x Time

• E = P x T

• E = 1.5 kW x 1.0 hour

• E = 1.5 kWh

Something to remember of 1.65 kW.

• Power must be in kW

• 1000 W = 1 kW

• To change from W to kW divide by 1000

Example of 1.65 kW.

• Example 1

• 400 W = ? kW

• 400 ÷ 1000

• = 0.4 kW

Example of 1.65 kW.

• Example 2

• 15 W = ? kW

• 15 ÷ 1000

• = 0.015 kW

Example of 1.65 kW.

• Example 3

• 3750 W = ? kW

• 3750 ÷ 1000

• = 3.75 kW

• Example 1 of 1.65 kW.

• 45 min = ? h

• 45 ÷ 60

• = 0.75 hours

• Example 2 of 1.65 kW.

• 5 min = ? h

• 5 ÷ 60

• = 0.08 hours

• Example 3 of 1.65 kW.

• 90 = ? h

• 90 ÷ 60

• = 1.5 hours

More examples of 1.65 kW.

Using a stereo with a rating of 30 W for 2 hours.

• E = P x t

• E = (30W ÷ 1000) x 2 h

• E = 0.03 kW x 2h

• E = 0.06 kWh