Y9 sci Ohm's law intro

Multiple Choice

Recall which variable the symbol I represents. (capital i)

• Current

• Voltage

• Power

• Resistance

Multiple Choice

Recall which variable the symbol V represents.

• Current

• Voltage

• Power

• Resistance

Multiple Choice

Recall which variable the symbol R represents.

• Current

• Voltage

• Power

• Resistance

Multiple Choice

Recall which symbol is used to represent the units of resistance.

• R

• Ω

• α

• β

Multiple Choice

USE YOUR NOTES!

A lightbulb has a constant resistance.

The current entering the lightbulb is increased.

State what happens to the voltage across the lightbulb.

• increases

• decreases

• stays the same

• exponential

Multiple Choice

USE YOUR NOTES!

A speaker has a constant resistance.

The current entering the speaker is not changed.

State what happens to the voltage across the speaker.

• increases

• decreases

• stays the same

• exponential

Multiple Choice

USE YOUR NOTES!

A refrigerator has a constant resistance.

The voltage across the refrigerator is decreased.

State what happens to the current through the fridge.

• increases

• decreases

• stays the same

• exponential

Multiple Choice

USE YOUR NOTES!

A toaster has a constant resistance.

The voltage across the toaster is increased.

State what happens to the current through the toaster.

• increases

• decreases

• stays the same

• exponential

Multiple Choice

USE YOUR NOTES!

A battery in a circuit has a constant voltage.

The resistance of a bulb in the circuit is increased.

State what happens to the current through the bulb.

• increases

• decreases

• stays the same

• exponential

Multiple Choice

USE YOUR NOTES!

A battery in a circuit has a constant voltage.

The resistance of a bulb in the circuit is kept the same.

State what happens to the current through the bulb.

• increases

• decreases

• stays the same

• exponential

Multiple Choice

USE YOUR NOTES!

A battery in a circuit has a constant voltage.

The resistance of a bulb in the circuit is decreased.

State what happens to the current through the bulb.

• increases

• decreases

• stays the same

• exponential