Electrical Work and Power

What is Electrical Work?

• The work done by voltage

• The work done by current

• The flow of current

• The charge by current

Electrical work (W) depends on...

• Applied Voltage. (V)

  Current passed through the object. (I)

• Applied Voltage. (V)

  and

  Time. (t)

• Current passed through the object. (I)

  Time. (t)

• Applied Voltage. (V)

  Current passed through the object. (I)

  Time. (t)

    The Equation for Electrical Work is...

• W = V x I x t

• W = V / I / t

• W + V x I x t

• W = U - I - t

Unit for electrical work is....

• Voltage

• Ampere

• Joule

• Watt

Unit of Voltage is...

• Ohm

• Ampere

• Joule

• Volts

Unit of Current is...

• Ampere

• Joule

• Volt

• Ohm

Unit of time is...

• Volt "V"

• Ampere "A"

• Joule "J"

• Seconds "s"

WHAT IS Electric Power?

•  The quantity

   that describes

   how slow

  the current is doing work

•  The quantity

   that describes

   how fast

  the current is doing work

•  The quantity

   that describes

   how fast / slow

  the current is doing work

•  The quantity

   that describes

   how fast / slow

  the wire is doing work

How much is the Electrical Power?

Applied voltage : 5 V

 Current : 2 A

• 10W

• 7W

• 2,5W

• 100W

If you have an electrical appliance, the resistance is 5Ω，applied voltage is 15V, what is the power?

•    Current = 15V / 5Ω = 3A

     P = VI = 15V - 3A = 13W

•    Current = 15V / 5Ω = 3A

     P = VI = 15V × 3A = 45W

•    Current = 15V x 5Ω = 60A

     P = VI = 15V × 60A = 900W

•    Current = 15V / 5Ω = 3A

     P = VI = 15V + 3A = 18W