# 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

# Electromative Force

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) Electromotive Force is defined as

 the force that move all electrons across the entire circuit. the energy that move all electrons across the entire circuit. the energy converted from non-electrical forms to electrical form when one coulomb of positive charge passes through the cell. the force supply to the circuit by an electric source to move one unit of charge across the entire circuit.

2) If a 6 V cell supplies a current of 0.3 A to a 19 Ω resistor, find the internal resistance of the battery.

 0.5 Ω 1.0 Ω 1.5 Ω 2.0 Ω

3) A cell has internal resistance of 1Ω. The potential difference across the cell is 5V when a current of 2A flows through it. Find the e.m.f. of the cell.

 5V 6V 7V 8V

4) When a voltmeter is connected across a cell, it gives a reading of 1.5 V. When a resistor of 9 Ω is connected across the voltmeter, it gives a reading of 1.35 V. Find the internal resistance of the cell?

 0.1Ω 0.5Ω 1.0Ω 1.5Ω

5) A cell with e.m.f. 6V and internal resistance, 1Ω is connected to a 5Ω resistor, and a voltmeter is connected across the resistor as shown in the diagram. Find the reading of the voltmeter.

 5.5 V 5.0 V 4.5 V 4.0 V

6) The diagram above shows a simple circuit that connected to a resistor. When the switch is off, the voltmeter shows a reading of 3.0V. When the switch is on, the voltmeter shows a reading of 2.4V. What is the internal resistance of the cell?

 1 Ω 2 Ω 3 Ω 4 Ω

Question 7 and 8

When a 5Ω resistor is connected to the terminal of a cell, the current in the resistor is 5A. When the resistor is replaced by another resistor with resistance 30Ω, the current become 1A.

7) Find the internal resistance of the cell

 1.25 Ω 1.00 Ω 0.75 Ω 0.50 Ω

8) Find the e.m.f. of the cell

 12.50 V 20.25 V 27.25 V 31.25 V

Question 9 and 10

An experiment was carried out to determine the e.m.f. and the internal resistance of a dry cell. The result was plotted on a graph as shown in the diagram above.

9) Find the internal resistance of the cell.

 1.33 Ω 1.00 Ω 0.75 Ω 8.00 Ω

10) What is the e.m.f of the cell?

 5V 6V 8V 14V