Electricity 4: Energy and Power

Electric Energy and Power

By Akram Varqid

Electric as a type of energy

The higher electricity, Higher energy

Electric energy can be related with voltage, current and resistance

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From V = W/Q and I = Q/t

W = Q V and Q=It

We will get W = It x V or simpler as

​W = Vit​

Work and Energy are the same​, their si unit is Joule

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Modifying Formula

Sometimes you dont get V, I and T

From V = IR, use it to replace what you don't have.

If you dont have V, Replace it with IR and so on. So we got:

E=VIt

E= (V²/R)t

E= I²Rt​

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Power = Energy / time

Similar with electrical power, remove time from Energy formula

P = VI

P = V²/R

P= I² R​

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Quizzez

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Multiple Choice

E = 10

V = 8

I = 6

t = ?

• 0.2 s

• 0.3 s

• 0.4 s

Multiple Choice

E = 10

V = 8

I = 6

What is the power?

• 80

• 60

• 48

Multiple Choice

E = ?

V = 5

R = 2

t = 10

• 125

• 250

• 375

Multiple Choice

E =

V = 5

R = 2

t = 10

What is the power?

• 12.5

• 25.0

• 37.5

Multiple Choice

E= 20

I = 9

R = ?

t = 20

• 0.01

• 0.02

• 0.03

Multiple Choice

E= 20

I = 9

R = ?

t = 20

What is the power?

• 0.05

• 0.0005

• 0.5