ELECTRIC CURRENT-The flow of charges.
Charges flow from the positive terminal to the
There must be intermediary path for the charges
There must be potential difference between two
points. This will literally push the charges from one
terminal to another. The greater the potential, the
greater the push.
VOLTAGE- electrical potential difference, electric
tension or electric pressure
RESISTANCE- property of a conductor due to which it
opposes the flow of current through it.
According to ohm’s law, the resistance of a metallic
conductor depends on the following:
1. Length of the conducting wire- the longer the
wire, the higher its resistance.
2. Cross-sectional area of the conductor- the thicker
the conductor, the lower the resistance.
3. Nature of the conductor- the more free electrons
there are, the lower the resistance.
ρ=resistivity of the conductor (Ω·m /
L=length of the wire (m)
A= cross sectional area (m2)