U3.6 – E.M.F & Internal Resistance

1

E.M.F and Internal Resistance

1 / 10

The electromotive force, or e.m.f. (Ɛ), is measured in which unit?

2 / 10

A 12 Ω and a 10 Ω resistor are connected in series with a battery of e.m.f. 6 V and internal resistance 2 Ω. Calculate the potential difference over the battery.

3 / 10

A battery of e.m.f. 7 V is connected across a 42 Ω resistor. If the potential difference across the resistor is 6 V, calculate the internal resistance of the cell.

4 / 10

Which of these expressions is not a correct expression for calculating Ɛ?

5 / 10

What is Ɛ measured in terms of SI base units?

6 / 10

A battery of e.m.f. 1.5 V with an internal resistance of 0.5 Ω is connected in series to a 5 Ω resistor. Calculate the current in the circuit.

7 / 10

Plotting a graph of V against I, what is the gradient equal to?

8 / 10

A cell of e.m.f. 3.0 V and internal resistance 0.3 Ω is connected in a series with an ammeter reading 0.25 A and a motorised hula girl who dances when the circuit is complete. Calculate the power supplied by the cell.

9 / 10

A battery with internal resistance 0.4 Ω and an e.m.f. of 15 V powers a portable speaker with a resistance of 9 Ω. Calculate the voltage across the speaker when it is being used.

10 / 10

A battery of e.m.f. E, with an internal resistance, r, was connected in series with a variable resistor, R and an ammeter. Looking at the readings from the above table, calculate the e.m.f. of the battery.

Thank you for taking the quiz. Please fill in the fields below and you will receive your results in an email.

If you have been set this as homework, you should forward this email to your teacher as evidence you have completed the quiz.

If you don't receive your email please check your spam or junk folder.

Your score is

0%