Understanding Electrical Resistance

What is electrical resistance?

• A measure of how much a material opposes the flow of electric current

• The energy stored in a conductor

• A force that accelerates electrons

• The speed at which electrons move

How do electrons move in a conductor when connected to a cell?

• From the positive terminal to the negative terminal

• In a zigzag pattern

• From the negative terminal to the positive terminal

• In a circular motion

According to Ohm's Law, how is resistance calculated?

• Voltage divided by current

• Voltage multiplied by current

• Current minus voltage

• Current divided by voltage

What happens to the resistance when conductors are joined in series?

• Resistance becomes zero

• Resistance decreases

• Resistance remains the same

• Resistance increases

Which factor does NOT affect the resistance of a wire?

• Length of the wire

• Color of the wire

• Material of the wire

• Temperature of the wire

How does the length of a wire affect its resistance?

• Resistance is the same for all lengths

• Length does not affect resistance

• Longer wires have more resistance

• Longer wires have less resistance

What is the effect of increasing the thickness of a wire on its resistance?

• Resistance decreases

• Resistance increases

• Resistance remains unchanged

• Resistance becomes infinite

Why do different materials have different resistances?

• Due to different colors

• Because of different atomic structures and concentrations

• Due to their weight

• Because they are made in different factories

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

• Resistance decreases

• Resistance remains the same

• Resistance increases

• Resistance becomes zero

Which of the following materials is likely to have high resistance?

• Copper

• Aluminum

• Glass

• Silver