# 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

The SPM Physics Workbook is developed under the One-School.net Free Books Project. The content of this book is strictly follow Malaysia SPM (Sijil Pelajaran Malaysia) syllabus. The aim of this project is to provide a complete electronic supplementary network for students to develop self-learning skills by breaking the spoon-feed rituals and to encourage them to compile educational information from the Internet.
1) Which of the following graphs correctly shows a current passing through an Ohmic conductor if the temperature of the conductor remains unchanged?

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

 2A 15A 30A 45A

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

 60 Ω 120 Ω 240 Ω 480 Ω

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

 25V 40V 60V 80V

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

 2.0 Ω 2.4 Ω 2.8 Ω 3.2 Ω

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

 I, II and III II, IV and V only I, II, III and IV only I, II, III and V only

7) The resistance of a wire is

 directly proportional to the length of the wire. inversely proportional to the length of the wire. is not depends on the length of the wire.

8) The figure shows the current-voltage graph of 3 difference resistors, X, Y and Z. Which of the resistors has lowest resistance?

 X Y Z Can't be determined from the graph

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

 supermagnet super-resistor superconductor super-battery

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

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