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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 energy1
Measuring Electrical Energy

What is Energy?

  • Energy- The ability to do work

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




Observing sample circuits
Observing sample circuits

  • 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.




Calculating electrical energy
Calculating Electrical Energy does?

  • 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


How much energy is that
How much energy is that? does?

  • 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
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
Example of 1.65 kW.

  • Example 1

  • 400 W = ? kW

  • 400 ÷ 1000

  • = 0.4 kW


Example1
Example of 1.65 kW.

  • Example 2

  • 15 W = ? kW

  • 15 ÷ 1000

  • = 0.015 kW


Example2
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
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




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