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- 6 -

(c) (i) A fluorescent lamp is rated at lSW, l20Y. Calculate the current which the lamp
draws from the main supply.

( 3 marks)

(ii) Calculate the resistance of this lamp while it is lit.

( 3 marks)

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lamp
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Total 15

GO ON TO THE
o

5. P, Q and R represent blocks of copper mounted on insulating stands. At the start of an experiment, Pis
given some positive charges, but Q and R are left electrically neutral.
When R is momentarily earthed on the side furthest from P, what are the charges on Q and R respectively?

(2)

6 Calculate the power of an electric fire that draws a current of 8A from a 230V power supply.

(2)

7. What is the purpose of a fuse?

(1
)

8. Calculate the cost of running a 2kW device for 5 hours if units of electricity cost $ 8 each.

(3)
9. What is the difference between alternating and direct current?

(1)

21.
23.
22.
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..

24. In the space provided draw the accepted electrical
circuit s~nbol for each of the following components of A

a simple circuit.

(a) a wire crossing, but not connected to another wire

(b) a lamp

Ic) a fuse

(d) an open switch

(e) a resistor (fixed)

(f) an ammeter

25. Study the circuits below. The switch S is open. In
which circuit would lamp P not light but lamps Q and R

would?

R1(O) R2(O Physics Worksheet ,- Series & Parallel
R3( Resistance ac
) Q)
.- Camperdowr. High School
,
S 6 6
N~e: ___________~----_---------- ____ ( ) Date:
15 15 5
Class: .-~
10 10 5
--.-----.--------
5
20 10
20. State the difference between a series connection and a parallel connection (note: NOT
3 9 18 -~--
1
circuitl), Draw diagrams to illustrate the difference .
.~-- .. -----
10 I
I
15
i
3
---'---"'-.-'-'-
10 15 6
., -- --~--- --.--.--

21. Four resistors are connected in ."~I:L"i, ~s,hu'11j. If .1 current of 0.2. A is shown on the

-0 ~
ammeter, find: .

I 50 J-:i 100 t-rf 20 ~ 40 ~
22. the p.d. across each of the resistors:
50: 100: _____ :c. Q; 4Q: ______
-----
23. the resistance between J and N;
24. the p.d. between J and N:
25. the resistance between K and
N:
e. . the p.d. between K and N:
26. the resistance between J and M:
27. the p.d. between J and M:
28. Three resistors are connected in parallel, as shown. Fill in
the table below with the correct resistance values:

26.
28.
27.
29.

..... ".-

ross Xy ny

30. In the space provided draw the accepted electrical
circuit symbol for each of the following components of
a simple circuit.

la) a wire crossing, but not connected to another wire

(b) a lamp

(c) a fuse

(d) an open switch

(e) a resistor (fixed)

(f) an ammeter

31. Study the circuits below. The switch S is open. In
which circuit would lamp P not light but lamps Q and R

would?

A 5

"LU
A 5 5

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