Potential Difference And Resistance

Question 1

What does the Ammeter Measure?

Answer 1

The Current through the Torch Bulb. It’s Connected in Series with the Bulb, so the Current Through Them is the Same.

Question 2

What does the Voltmeter Measure?

Answer 2

Measure the Potential Difference Across the Torch Bulb. This is the Energy Transferred to the Bulb or the Work Done on it by Each Coulomb of Charge that Passes through it.

Question 3

The Voltmeter is Connected in ____________ with the Torch Bulb, so it Measure the Potential Different Coming Across it.

Answer 3

Parallel.

Question 4

Potential Different Across A Component (V) = Energy Transferred (__) / ___________ (C)

Answer 4

J…Charge…

Question 5

Electrons Passing through a Torch _______ have to Push their Way Through Lots of ____________ Atoms in the Metal Filament.

Answer 5

Bulb…Vibrating…

Question 6

Resistance (Ohms) = Potential Difference (___) / __________ (A)

Answer 6

V…Current…

Question 7

What is Ohm’s Law?

Answer 7

The Current Through a Resistor at Constant Temperature is Directly Proportional to the Potential Difference Across the Resistor.

Question 8

A Wire is Called an Ohmic Conductor Because its ______________ Stays Constant as the Current Changes, Provided its Temperature is ____________.

Answer 8

Resistance…Current…