F2 Science Electricity Exercise Top 'link' Direct

F2 Science – Electricity Comprehensive Exercise

Topic: Basic Electricity, Circuits, Current, Voltage, Resistance, & Ohm’s Law
Target Level: Form 2 (Ages 13–14)
Total Marks: 50
Time Suggested: 60 minutes

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Section A: Multiple Choice Questions

1. Which of the following correctly states Ohm's Law? A. Current is directly proportional to Voltage. B. Voltage is inversely proportional to Resistance. C. Resistance is directly proportional to Current. D. Current is inversely proportional to Voltage.

2. In a Series circuit, if one bulb burns out: A. The other bulbs will shine brighter. B. The other bulbs will stay lit. C. The circuit is broken and all other bulbs go out. D. The battery will explode.

3. Which component is used to measure the potential difference across a resistor? A. Ammeter B. Voltmeter C. Ohmmeter D. Galvanometer f2 science electricity exercise top

4. Which wire connects the metal casing of an appliance to the ground to prevent electric shock? A. Live wire B. Neutral wire C. Earth wire D. Fuse wire

Section C

1. series
2. current
3. resistance
4. parallel
5. voltage

2. Series Circuit Laws

• Current (I): Same everywhere. ( I_total = I_1 = I_2 )
• Voltage (V): Shared. ( V_total = V_1 + V_2 )
• Resistance (R): Adds up. ( R_total = R_1 + R_2 )
• Effect of breaking a bulb: All bulbs go out.

1. Circuit Symbols (Must memorize)

• Cell/Battery: Long line (+) and short line (-).
• Bulb: A cross inside a circle.
• Ammeter: A circle with an 'A' (Series connection).
• Voltmeter: A circle with a 'V' (Parallel connection).

Section D: Circuit Diagram Analysis (12 marks)

Study the circuit diagram described below (draw it yourself if needed):

• A 9V battery connected to two resistors: R₁ = 2Ω and R₂ = 4Ω in series.
• An ammeter is placed in the main loop to measure total current.
• A voltmeter is placed across R₂.

Questions:

1. (2 marks) Calculate the total resistance in the circuit.
2. (2 marks) Calculate the total current flowing from the battery.
3. (2 marks) Calculate the voltage across R₂.
4. (2 marks) If R₁ were removed (open circuit), what would happen to the current? Explain.
5. (4 marks) Redraw the described circuit in the space below (write description or sketch in words – or on paper if doing physically). Label all components.

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Section D: Circuit Analysis (2 × 5 marks = 10 marks)

D1. Draw a circuit diagram with:

• Two cells in series
• One bulb
• One switch
• An ammeter measuring current through the bulb
• A voltmeter measuring voltage across the bulb

(Label all components clearly – 5 marks)

D2. A student builds two circuits with two identical bulbs. Section A: Multiple Choice Questions 1

| Circuit | Type | Bulb brightness | If one bulb breaks, other? | |---------|------|----------------|----------------------------| | A | Series | ? | ? | | B | Parallel | ? | ? |

Complete the table:

• Brightness (brighter / dimmer compared to single bulb circuit)
• Effect of one bulb breaking (works / does not work)

(5 marks)

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Section C: True or False (5 marks)

Write T or F next to each statement.

1. _____ Current flows from the negative terminal to the positive terminal inside a battery.
2. _____ Adding more bulbs in parallel makes each bulb dimmer.
3. _____ A longer wire has higher resistance than a shorter wire of the same thickness and material.
4. _____ A switch in the off position acts like an open circuit.
5. _____ 1 mA = 1000 A.

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1. The Big Three: Voltage, Current, and Resistance

Before you can solve any calculation problem, you need to understand the relationship between the three main characters in an electric circuit. Memorize this triangle!