Malaysia SPM Form 5 Physics - Electricity

1.1 Electric Charge
1.2 Electric Current
1.3 Potential Difference
1.4 Ohm's Law & Resistance
2.1 Circuit - Resistance
2.2 Circuit - Current
2.3Circuit - Potential Difference
3.1 Electromotive Force (E.M.F.)
4.1 Electrical Energy and Power

Ohm's Law and Resistivity

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1) Which of the following graphs correctly shows a current passing through an Ohmic conductor if the temperature of the conductor remains unchanged?

Choice 1
Choice 2
Choice 3
Choice 4


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2) What is the current through an 8Ω radio when it is operating at 240V?

Choice 1
2A
Choice 2
15A
Choice 3
30A
Choice 4 45A



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3) A potential difference of 240 V applied across the heating coil of an electric kettle drives a current of 2A through the coil. Find the resistance of the coil


Choice 1
60 Ω
Choice 2
120 Ω
Choice 3
240 Ω
Choice 4 480 Ω


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4) Determine the potential difference between the ends of a wire of resistance 5Ω if 720 C passes through it per minute.


Choice 1
25V
Choice 2
40V
Choice 3
60V
Choice 4 80V


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5) The graph shows the potential difference across a wire against its current. Find the resistance of the wire from the graph.


Choice 1
2.0 Ω
Choice 2
2.4 Ω
Choice 3
2.8 Ω
Choice 4 3.2 Ω


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6) The resistance of a resistor is affected by

I  the length of the conductor
II  type of the material make up of the resistor
III  cross sectional area of the resistor
IV  potential difference across the resistor
V  temperature of the resistor

Choice 1
I, II and III
Choice 2
II, IV and V only
Choice 3
I, II, III and IV only
Choice 4 I, II, III and V only


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7) The resistance of a wire is

Choice 1
directly proportional to the length of the wire.
Choice 2
inversely proportional to the length of the wire.
Choice 3
is not depends on the length of the wire.
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8) The figure shows the current-voltage graph of 3 difference resistors, X, Y and Z. Which of the resistors has lowest resistance?

Choice 1
X
Choice 2
Y
Choice 3
Z
Choice 4 Can't be determined from the graph


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9) The resistance of a _______________ will falls to zero when its temperature is close to 0 K.

Choice 1
supermagnet
Choice 2
super-resistor
Choice 3
superconductor
Choice 4 super-battery


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10) Which of the following is not the application or potential use of a superconductor?


Choice 1
Superconductor can be used to produce a high efficient battery.
Choice 2
Superconductor is used in the scanning device such as CT scan an MRI (Magnetic Resonance Imaging).
Choice 3
Superconductor is used in power transmission to reduce power lost.
Choice 4 Superconductor is used for making strong superconducting electromagnets in the magnetic levitation train.


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electromagnetism notes