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Phy Y10Y11 Y11 C19_3 Potential Divider

Total questions: 38

Worksheet time: 52mins

Name
Class
Date
1.

Potential of A

a)

0V

b)

1.5V

c)

3V

d)

6V

2.

Potential of B

a)

0V

b)

1.5V

c)

3V

d)

6V

3.
4 lines
4.
4 lines
5.
4 lines
6.
4 lines
7.
4 lines
8.
4 lines
9.
4 lines
10.
4 lines
11.
4 lines
12.
4 lines
13.
4 lines
14.
4 lines
15.
4 lines
16.

Light levels decrease. What happens to V2?

a)

V2 decreases

b)

V2 stays the same

c)

V2 increases

17.

Light levels increase. What happens to V1?

a)

V1 increases

b)

V1 stays the same

c)

V1 decreases

18.

The temperature goes down. What happens to V?

a)

V decreases

b)

V stays the same

c)

V increases

19.

The temperature increases. What happens to V?

a)

V increases

b)

V stays the same

c)

V decreases

20.

At a particular temperature, the p.d across the fixed resistor is 3V. The fixed resistor is 4.7kohms. What is the resistance of the thermistor at this temperature?

a)

14.1kohm

b)

9.4kohm

c)

2350ohms

21.

V = 15V, V2 = 9.5V, RLDR = 2500ohms. What is the value of R1?

a)

4320ohms

b)

660ohms

c)

1450ohms

22.

A circuit is set up with an LDR and a fixed resistor as shown.

The voltmeter reads 4 V.

The light intensity is increased.

What is a possible voltmeter reading?

a)

3 V

b)

4 V

c)

6 V

d)

8 V

23.

A thermistor and another component are connected to a constant voltage supply. A voltmeter is connected across one of the components. The temperature of the thermistor is then reduced but no other changes are made.

In which circuit will the voltmeter reading increase?

a)

A

b)

B

c)

C

d)

D

24.

R1 = 50ohms, R2 = 250ohms, V = 12V, what is V1?

a)

1V

b)

2V

c)

3V

d)

4V

25.

In the circuit shown in the diagram the cell has negligible internal resistance.


What happens to the reading of both meters when the resistance of R is decreased?

a)

Reading of ammeter: increases

Reading of voltmeter: increases

b)

Reading of ammeter: increases

Reading of voltmeter: decreases

c)

Reading of ammeter: decreases

Reading of voltmeter: increases

d)

Reading of ammeter: unchanged

Reading of voltmeter: decreases

26.

Resistors X and Y are connected in series with a 6.0 V battery of negligible internal resistance.


X has resistance R and Y has resistance R/2.


A voltmeter of resistance R is connected across Y.


What is the reading on the voltmeter?

a)

0.0 V

b)

1.5 V

c)

3.0 V

d)

4.5 V

27.

There are ............ types of potential divider

a)

1

b)

2

c)

3

d)

4

28.

Fixed Potential divider is a ............................ circuit with two resistors.

a)

parallel

b)

series

c)

series and parallel

29.

For a fixed potential divider, which equation is correct?

a)

R1 x R2 = V1 x V2

b)

R1/V2 = R2/V1

c)

R1/R2 = V1/V2

d)

R1 x V1 = R2 x V2

30.

A 3.0Ω lamp and a 6.0Ω lamp are connected in series.

What is the total resistance of the combination?

a)

0.5 Ω

b)

2.0 Ω

c)

9.0 Ω

d)

18 Ω

31.

A lamp is to be connected in a circuit so that the p.d. across it can be varied from 0 to 6 V. Which circuit would be most suitable?

a)

A

b)

B

c)

C

d)

D

32.

Conversion of ac into dc is called......

a)

polarization

b)

reflection

c)

alternating current

d)

rectificatio.

33.

----------- allows current to pass in one direction.

a)

LED

b)

Diode

c)

transistor

d)

battery

34.

A circuit is set up with an LDR and a fixed resistor as shown.

The voltmeter reads 4 V.

The light intensity is increased.

What is a possible voltmeter reading?

a)

3 V

b)

4 V

c)

6 V

d)

8 V

35.

A thermistor and another component are connected to a constant voltage supply. A voltmeter is connected across one of the components. The temperature of the thermistor is then reduced but no other changes are made.

In which circuit will the voltmeter reading increase?

a)

A

b)

B

c)

C

d)

D

36.

R1 = 50 ohms, R2 = 250 ohms, cell has a voltage V = 12V, Using the formula, R1R2=V1V2\frac{R_1}{R_2}=\frac{V_1}{V_2}   , what is V2?

a)

11V

b)

10V

c)

13V

d)

14V

37.

The figure shows a light dependent resistor (LDR) and fixed resistor R connected in series across a cell. The internal resistance of the cell is negligible.

Voltage is directly proportional to resistant (V=IR) and resistance increases with temperature due to increased vibrations of the molecules inside the conductor. Therefore ...

a)

voltage remains same as temperature decreases.

b)

voltage increases as temperature decreases.

c)

voltage decreases as temperature increases.

d)

voltage increases as temperature increases.

38.

A circuit is set up with an LDR and a fixed resistor as shown.

t's because LDRs are made of semiconductors- unlike normal conductors, they conduct better under higher heat/light.This means the resistance is decreasing.As to why-Semiconductors' electrons will become 'excited' (yep, thats what its called) as it gains more energy from light or heat, and this frees up more electrons to carry charges across the semi conductor.The more electrons there are, the less resistance the semi conductor has.The LDR behaves like this because it uses a semiconductor which gets its electrons excited through light energy

a)

V

b)

V

c)

V

d)

V

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