Question 1

Marks: 1

Five resistors of equal resistance are connected to a cell as shown.

5-3-sl-mcq-hard-q1-phy

Which of the following is correct about the power dissipated P_X, P_Y and P_Z in resistors X, Y and Z respectively?

	P_X	P_Y	P_Z
A.	$I^{2} R$	$\frac{1}{3} I^{2} R$	$\frac{2}{3} I^{2} R$
B.	$\frac{1}{4} I^{2} R$	$\frac{1}{3} I^{2} R$	$\frac{4}{9} I^{2} R$
C.	$I^{2} R$	$\frac{1}{9} I^{2} R$	$\frac{2}{3} I^{2} R$
D.	$\frac{1}{4} I^{2} R$	$\frac{1}{9} I^{2} R$	$\frac{4}{9} I^{2} R$

Key Concepts

Terminal Potential Difference

Question 2

Marks: 1

Two cells, X and Y, each with internal resistance 1.0 Ω, are connected in a circuit with two resistors as shown.

5-3-sl-mcq-hard-q2-phy

Which of the following statements is not correct?

The circuit charges cell X
The power dissipated in cell X is greater than the power dissipated in cell Y
The charging current is 3.0 A
The circuit charges cell Y

Key Concepts

Electromotive Force

Question 3

Marks: 1

A cell with e.m.f. V₀ and negligible internal resistance is connected across a uniform resistance wire of length XY.

5-3-sl-mcq-hard-q3-phy

The flying lead connected at X and is able to connect to XY at any distance r from X.

Which expression correctly determines the reading on the voltmeter, V?

$r$
$V_{0} r$
$\frac{r}{X Y}$
$\frac{V_{0} r}{X Y}$

Key Concepts

Electromotive Force
Internal Resistance

Question 4

Marks: 1

A circuit contains two batteries, an external resistor and a motor, which is attached to a pulley that lifts a load. The direction of current in the circuit is indicated.

5-3-sl-mcq-hard-q4-phy

Which of the following energy transformations most accurately describes the behaviour of the circuit?

chemical → electrical + thermal + mechanical
chemical + electrical → mechanical + thermal
chemical → electrical + thermal + mechanical + gravitational
chemical + electrical → thermal + mechanical + gravitational

Key Concepts

Primary & Secondary Cells
Investigating Electric Cells

Question 5

Marks: 1

A pump is designed to move water through a certain height h such that the water flows back down, turning a paddle wheel. Such a system is often used to explain the operation of a battery in an electric circuit.

5-3-sl-mcq-hard-q5-phy

Which row in the table below best contrasts the work done by the pump and a battery?

	Pump	Battery
A.	Does work on the water flowing in the pump	Does work on the current flowing in the wires
B.	Does work on the water flowing in pipes	Does work on the current flowing in the wires
C.	Does work on the water flowing in the pump	Does work on the ions in the battery
D.	Does work on the water flowing in the pipes	Does work on the ions in the battery

Key Concepts

Primary & Secondary Cells
Investigating Electric Cells

Question 6

Marks: 1

A 24 V solar panel charges a 12 V battery with internal resistance 0.10 Ω.

5-3-sl-mcq-hard-q6-phy

Which of the following is correct?

	V₁	V₂
A.	18	12.6
B.	30	–12.6
C.	18	–12.6
D.	30	12.6

Key Concepts

Internal Resistance

Question 7

Marks: 1

A cell has internal resistance r.

A graph of terminal potential difference V across the cell against current drawn from the cell I is shown. The scales are such that the length $O ε$ is equal to the length $O (ε / r)$ . A point P is chosen on the graph, such that $(O) (ε / 2) (P) (ε / 2 r)$ is a square.

5-3-sl-mcq-hard-q7-phy

Which of the following statements is correct?

P is the point at which the load resistance is maximum
P is the point at which maximum power is delivered by the cell
P is the point at which minimum power is delivered by the cell
P is the point at which the internal resistance of the cell reduces to zero

Key Concepts

Internal Resistance

Question 8

Marks: 1

Which of the following correctly describes the electromotive force of a cell?

The difference in energy between that needed to drive unit charge through the load resistance and through the cell
The energy used to drive unit charge through the load resistance
The energy used to drive unit charge through the cell's internal resistance
The total energy used to drive unit charge round the complete circuit

Key Concepts

Internal Resistance

Question 9

Marks: 1

The figure shows how the e.m.f. of a simple generator varies with time.

5-3-sl-mcq-hard-q9-phy

Which of the following statements is incorrect?

The alternating e.m.f. does not affect the internal resistance of the generator
The frequency of the e.m.f. is 200 Hz
The internal resistance of the generator alternates with a frequency of 200 Hz
The internal resistance of a power supply depends on its capacity

Key Concepts

Internal Resistance

Question 10

Marks: 1

Two almost identical lead-acid accumulator batteries, X and Y, are connected in a circuit as shown.

5-3-sl-mcq-hard-q10-phy

The following information is provided:

When S₁ is closed and S₂ remains open, the millivoltmeter reads 60 mV
When both S₁ and S₂ are closed, the reading on the millivoltmeter changes by 20 mV and the ammeter reads 5.0 A

What is the resistance of R?

2.0 mΩ
2.0 Ω
2.0 kΩ
20 kΩ

Key Concepts

Internal Resistance
Electromotive Force

DP IB Physics: SL

Topic Questions

5.3 Electric Cells

Question 1

Key Concepts

Question 2

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Question 3

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Question 4

Key Concepts

Question 5

Key Concepts

Question 6

Key Concepts

Question 7

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Question 8

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Question 9

Key Concepts

Question 10

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