Electrical resistance

The video explains resistance in electrical circuits, measured in ohms, and how it varies with different materials. It highlights that higher resistance makes it harder for current to flow. Resistance increases with the length of a wire and decreases with its thickness, which is why overhead power cables are thick to reduce resistance and facilitate current flow over long distances.

What is the unit of measurement for resistance in a circuit?

• Ohms

• Amperes

• Volts

• Watts

How does high resistance affect the flow of current in a wire?

• It makes it easier for current to flow

• It increases the speed of current flow

• It makes it harder for current to flow

• It has no effect on current flow

Which of the following factors increases the resistance in a wire?

• Decreasing the temperature

• Increasing the length

• Increasing the thickness

• Decreasing the length

Why are overhead power cables designed to be thick?

• To increase resistance

• To reduce resistance

• To increase their length

• To make them lighter

What happens to resistance when the thickness of a wire is increased?

• Resistance becomes infinite

• Resistance remains the same

• Resistance decreases

• Resistance increases