AP Tues 2 Feb

Tuesday 1 Feb:

Electricity Quiz #3

Quiz: Circuits/ Electricity       Name_____________________________

Electricity III

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1.) If a current of 3 A is divided by the following circuit, the current flowing through the 4 Ohm resistor is …

1

3 A

2

2 A

3

1,5 A

4

1 A



2.) The diagram at the right shows part of a circuit into which a current I is flowing. Which ammeter shows the highest reading?

1

A₁

2

A₂

3

A₃

4

All three ammeters give the same reading

3.) The diagram to the right represents a part of a circuit containing an ohmic resistor, a voltmeter and an ammeter. If the reading on the ammeter A increases the reading on voltmeter V …

1

increases in the same ratio.

2

increases, but not in the same ratio.

3

remains unchanged.

4

decreases in the same ratio.

4.) A battery is connected to two identical light bulbs in parallel as well as another identical bulb in series. An ammeter and a voltmeter are also connected as shown in the circuit diagram below.

One of the light bulbs connected in parallel is unscrewed. How will the ammeter and the voltmeter readings change?

   Voltmeter reading

   Ammeter reading

1

increases

increases

2

increases

decreases

3

increases

unchanged

4

decreases

decreases

5.) A learner connects a circuit as shown in the diagram to the right. He/she uses a source of electricity with an electromotive force (emf) of 12 V.   Which one of the following best gives the ammeter and voltmeter readings which the learner is most likely to get with this circuit?

Ammeter reading

Voltmeter reading

1

reads zero

reads zero

2

reads zero

reads 12 V

3

very large reading

reads zero

4

very large reading

reads 12 V

6.) Three identical resistors of 4 W are connected to give a combined resistance of 6 W. Which of the following circuit diagrams illustrates how this was done?

1

I

2

II

3

III

4

IV



7.) In the circuit to the right B₁, B₂ and B₃ are identical light bulbs. The internal resistance of the battery can be ignored.
Which statement is true regarding the relative brightness of the bulbs?

1

The three bulbs glow with the same brightness.

2

B₂ and B₃ glow with the same brightness but brighter than B₁.

3

B₂ and B₃ glow with the same brightness but less brightly than B₁.

4

B₁ glows brighter than B₂ while B₂ in turn glows brighter than B₃.



8.) Two identical light bulbs, X and Y, are connected in series as shown in the sketch to the right.
How will the brightness of the bulbs change if switch S is closed?



X

Y

1

brighter

brighter

2

dimmer

dimmer

3

brighter

not lit up

4

not lit up

brighter



9.) A student connects three identical resistors as shown in the sketch to the right.
The potential difference across the battery is 12 Volt. What are the readings on V₁ and V₂ respectively?

V₁

V₂

1

4

8

2

6

6

3

8

4

4

9

3



10.) A 9 V battery is composed of six 1,5 V cells, which are connected in series. Each cell has an internal resistance of 0,2 W. What is the highest current that can be obtained from such a battery?

1

7,5 A

2

1,5 A

3

1,2 A

4

0,3 A

Top of Form

11.) Which one of the circuits shown in the diagram below can be used to determine the resistance of R?

1

I

2

II

3

III

4

IV



12.) A car's starter motor draws a current of 100 A at 12,0 V when starting the engine. The mechanical power required to turn the engine is 960 W. At what rate is energy from the battery converted to non-mechanical forms of energy?

1

240 W

2

960 W

3

1200 W

4

1440 W

13) In the circuit shown below one of the bulbs blew. The result was that all bulbs stopped glowing. Which bulb blew?

1

bulb a

2

bulb b

3

bulb c

4

bulb d

14.) Three resistors are connected to a battery as shown in the diagram. At which point in the circuit is the current the smallest?

1

a

2

b

3

c

4

d

15.) In the circuit shown, the resistance of the ammeter, the battery and the connecting wires are negligible. The voltmeter has a very high resistance. The ammeter reads 1,5 A. What is the reading on the voltmeter?

1

4 V

2

6 V

3

8 V

4

12 V

16.) Two resistors are connected in parallel as shown in the diagram. The current flowing through the ammeter is:

1

0,6 A

2

1,5 A

3

2,5 A

4

14,4 A

17.) Consider the circuit shown to the right. If switch S is closed, the readings on the voltmeter and ammeter will change as follows:

voltmeter reading

  ammeter reading

1

becomes zero

remains the same

2

becomes zero

increases

3

remains the same

decreases

4

decreases

increases



18.) The circuit below shows two identical bulbs, L and M, which are connected to a battery and a variable resistor R. How will the brightness of the bulbs be affected if the resistance of R is increased?

  bulb L

  bulb L

1

dimmer

brighter

2

dimmer

dimmer

3

dimmer

the same

4

brighter

the same



The information given in the box refers to questions 19 and 20:

The battery in the circuit has an internal resistance r and an emf E. The resistance of the ammeter and the conductors is negligible and the voltmeter has a high resistance

19.) When the switch S is closed, the …

   voltmeter reading

   ammeter reading

1

decreases

decreases

2

decreases

increases

3

increases

decreases

4

increases

increases

20.) When the switch S is closed the power in the resistors R₁ and R₂ …

   power in R₁

   power in R₂

1

decreases

decreases

2

decreases

increases

3

increases

decreases

4

increases

increases

Top of Form

21.) Consider the electric circuit shown in the diagram at the right.     The reading on the voltmeter V is ...

A

0 V

B

2 V

C

4 V

D

6 V

22.) Two light bulbs P and Q are identical in all respects, except that P's filament is thicker than Q's. If the same potential difference is applied to each, then …

A

P will burn brighter because it has the greater resistance.

B

Q will burn brighter because it has the greater resistance.

C

P will burn brighter because it has the lower resistance.

D

Q will burn brighter because it has the lower resistance.

23.) The ammeter and the battery in the sketch to the right have negligible resistance. The resistors are in parallel. What will happen to the ammeter and voltmeter readings when switch S is closed?

ammeter reading

voltmeter reading

A

increases

unchanged

B

increases

increases

C

decreases

decreases

D

decreases

increases

24.) In the circuit shown the bulb marked 2R has twice the resistance of the bulb marked R. Compared with bulb 2R, the current in bulb R and its brightness compared to the other bulb, is …

current in R

brightness in 2R

A

larger

brighter

B

larger

dimmer

C

smaller

brighter

D

smaller

dimmer

25.) A student connectes four identical light bulbs in a circuit as shown to the below. They observe that the brightness of bulb A varies if some of the switches are closed. In which case will bulb A burn brightest?

A

S₁ closed with S₂ and S₃ open

B

S₁ and S₂ closed with S₃ open

C

S₁, S₂ and S₃ closed

D

S₁, S₂ and S₃ open

26.) Two identical light bulbs X and Y, which are rated at 60 W; 240 V, are connected in series to a 240 V source as shown in the diagram below. If point A in the circuit is now connected to point B by a piece of copper wire with very low resistance, how will the brightness of each bulb change?

A

Both X and Y will burn brighter.

B

Both X and Y will burn less brightly.

C

X will burn brighter and Y will not burn.

D

Y will burn brighter and X will not burn.

27.) A battery is connected to a small lamp. If a second identical lamp is connected in series with the first, what will happen to the current provided by the battery?

A

it will decrease

B

it will remain the same

C

it will increase

D

it will become zero

28.) A 200 V electrical outlet is protected by a circuit breaker. The circuit breaker will cut out if the current drawn from the outlets exceeds 16 A. A 1000 W toaster and a 2000 W kettle can be connected to the outlet, either singly, or both in parallel using a double adapter. Which use of the appliances will trip the circuit breaker?

A

the toaster used on its own

B

the kettle used on its own

C

the toaster and the kettle together

D

none of the above

29.) Two light bulbs are marked 230 V; 75 W and 230 V; 150 W. If the first bulb has a resistance R, then the resistance of the second is …

A. ¼ R                         B. ½ R             C. 2 R              D. 4 R

30.) Two resistors of resistance 2R and 3R are connected in series with a battery, which has an emf of E and an internal resistance R. What is the potential difference across the resistor of resistance 2R?

A

E/3

B

2E/5

C

E/2

D

2E