Chapter 1: Current Electricity – Physics Form Six

CURRENT ELECTRICITY

Electricity is the study of electric charges and their effects. When electric charges move through a conducting material, the movement is called electric current.

Current electricity mainly deals with:

1. Electric current and charge flow
2. Electric conduction in metals
3. Electric conduction in gases
4. Direct current and alternating current
5. AC circuits
6. Resistance, reactance and impedance
7. RMS values
8. Power and power factor
9. Resonance in AC circuits

ELECTRIC CURRENT

Definition of Electric Current

Electric current is the rate of flow of electric charge through a conductor. Formula:

I = Q/t Where:

I = electric current in amperes (A) Q = electric charge in coulombs (C) t = time in seconds (s)

The SI unit of electric current is the ampere (A).

One ampere is the current when one coulomb of charge passes through a given point in a conductor in one second.

Example

A charge of 60 C flows through a conductor in 20 seconds. Find the current. Solution:

I = Q/t

I = 60/20 I = 3 A

Therefore, the current is 3 A.

Chapter 1: Current Electricity – Physics Form Six

READ FULL NOTES

DOWNLOAD PDF NOTES