Electrical resistance

What is the unit of measurement for resistance?

• Voltage

• Ampere

• Watts

• Ohms

Which resistor will prevent the most current flow?

• 1 ohm
• 100 ohms
• 1000 ohms
• 0.5k ohms

What is Resistance?

• the degree to which a circuit component opposes the passage of an electric current, causing energy dissipation
• How hard the energy is pushed
• The amount of charges that pass by a given point per second
• None of the above

How does resistance affect current?

• less resistance - less current
• more resistance - less current
• more resistance - more current
• resistance does not affect current

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

• Stays the same

• Increases

• Decreases

A student wants to investigate what happens to the resistance of a wire when longer wire is used. What is the indepenent variable?

• resistance
• length
• temperature of wire
• voltage of power supply
• current in circuit

What effect do electrons flowing through a resistor have on the resistor.

• make it glow

• reduce it's resistance

• increase it's resistance

• heat it up

The flow of charge in a circuit is known as the .....

• voltage

• potential difference

• amps

• current

Adding more resistors or lamps in series in a circuit will cause the total resistance to ......

• go down

• go up

If you increase the width of a wire then the resistance will.....

• decrease

• increase

• stay the same