Ohm's Law and Resistance

All conductors show some opposition to electrical current. This opposition to current is called resistance. There are several factors that affect the resistance of a conductor;

• material, eg copper, has lower resistance than steel
• length - longer wires have greater resistance
• thickness - smaller diameter wires have greater resistance
• temperature - heating a wire increases its resistance

The two main ways of increasing the current in an electrical circuit are by increasing the voltage or by decreasing the resistance. Changing the voltage: If you increase the voltage across a component, there will…