Published on February 16, 2014
CURRENT & VOLTAGE IN A CIRCUIT YEAR 9 – ELECTRICITY By S. Choi
AIM & HYPOTHESIS • Aim: To measure the current and voltage at different parts of an electric circuit. • Hypothesis: Write your own hypothesis on your experimental report.
EQUIPMENT • 1 × DC power pack • 1 × light globe • 1 × switch • 1 × ammeter • 1 × voltmeter • 6 × connecting wires
RISK ASSESSMENT Risk Injury Prevention
METHOD 1. Set up the circuit as shown in the diagram on the RHS. 2. With the switch OPEN, use the ammeter to measure the electric current at points: B, C & D. Record the results in the results table. 3. With the switch CLOSED, repeat step 2. Record the results in the results table.
METHOD 4. With the switch OPEN, use the voltmeter to measure the voltage across: - Points E & A (power pack) - Points A & B (connecting wire) - Points B & C (switch) - Points C & D (light globe) - Points D & E (connecting wire) Record the results in the results table. 5. With the switch CLOSED, repeat step 4. Record the results in the results table.
RESULTS Current in different parts of the circuit Switch Circuit location B OPEN C D B CLOSED C D Current (A)
RESULTS Voltage in different parts of the circuit Switch Circuit location Across E & A (power pack) Across A & B (connecting wire) OPEN Across B & C (switch) Across C & D (light globe) Across D & E (connecting wire) Across E & A (power pack) Across A & B (connecting wire) CLOSED Across B & C (switch) Across C & D (light globe) Across D & E (connecting lead) Voltage (V)
DISCUSSION 1. Was the current at points B, C & D the same or different when the switch was CLOSED? 2. Was the current at points B, C & D the same or different when the switch was OPEN? 3. Across which parts of the circuit were there readings in the voltmeter when the switch was CLOSED? 4. Across which parts of the circuit were there readings in the voltmeter when the switch was OPEN? 5. Explain how voltmeter readings occur even though the switch is not closed. 6. Compare the voltage across the terminals of the power pack with the voltage across the light globe.
CONCLUSION • Write your own conclusion of the experiment.
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