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SS1: PHYSICS – 3RD TERM

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  1. Production of Electric Current | Week 1
    6 Topics
    |
    1 Quiz
  2. Electric Current | Week 2
    5 Topics
    |
    1 Quiz
  3. Electrical Resistance of a Conductor | Week 3
    5 Topics
    |
    1 Quiz
  4. Particulate Nature of Matter | Week 4
    5 Topics
    |
    1 Quiz
  5. Crystalline and Non-crystalline Substances | Week 5
    3 Topics
    |
    1 Quiz
  6. Elastic Properties of Solids | Week 6 & 7
    4 Topics
    |
    1 Quiz
  7. Fluids at Rest & in Motion | Week 8 & 9
    6 Topics
    |
    1 Quiz
  8. Solar Collector
    3 Topics
    |
    1 Quiz



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In an electric circuit, work is done when electricity flows from a point of higher potential to a point of lower potential.

The work done, W, in moving a charge from one point to another when a potential difference p.d in volts is applied is

W = QV _____ (1)

but Q = IT

∴ = VIT

W = IVT ______(2)

Where I = current in Amperes 

t = seconds (time)

from Ohm’s law,

V = IR

Substituting V in eq (2)

W = I.IRt

W = \( \scriptsize I^2RT \) ____ (3)

also  V = IR

I = \( \frac {V}{R} \)

Using equation (2)

∴ W = IVt

W = \( \frac {V}{R} \scriptsize \: \times \: V \: \times \: t \)

W = \( \frac {V^2t}{R} \) ____ (4)

Electrical energy is measured in Joules.

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