Resistance _ GCSE Physics

The video tutorial explains how electrons moving through a conductor, like a metal wire, encounter resistance due to collisions with ions. It discusses how the length and thickness of a wire affect resistance, with longer and thinner wires having greater resistance. The resistance formula R = V/I is introduced, and the relationship between voltage and current is explored through graph plotting. The tutorial also covers how resistance in filament bulbs increases with temperature, resulting in an S-shaped graph due to increased ion vibration and electron collisions.

What happens to the resistance when the length of a wire increases?

• Resistance remains the same

• Resistance becomes zero

• Resistance increases

• Resistance decreases

Why does a thin wire have more resistance than a thick wire?

• It has more ions

• It is made of a different material

• It has fewer electrons to carry the current

• It is longer

What is the formula for calculating resistance?

• R = V*I

• R = V/I

• R = I/V

• R = V+I

How does the resistance in a fixed resistor relate to voltage?

• It decreases with voltage

• It is unrelated

• It is directly proportional

• It is inversely proportional

What happens to the resistance of a filament bulb as its temperature increases?

• Resistance becomes zero

• Resistance increases

• Resistance remains constant

• Resistance decreases