Physic Elecricity

Yr10 electricity topic

What is electrical resistance?

Electrical resistance is a measure of the opposition to the flow of electric current in a circuit.

What is the unit of electrical resistance?

The unit of electrical resistance is the Ohm, represented by the Greek letter Omega (\Omega).

What law describes the relationship between resistance, voltage, and current?

Ohm's Law describes this relationship: V = IR, where V is voltage, I is current, and R is resistance.

What factors affect the resistance of a material?

The resistance of a material is affected by:

• Length: Longer wires have more resistance.

• Cross-sectional area: Thicker wires have less resistance.

• Material: Different materials have different inherent resistivities.