Activity 7.7:
Aim: To study current, voltage and resistance in a series circuit.
Apparatus: Dry cell holder, connecting wire, bulb (1.5 V), dry cell, switch, ammeter and voltmeter
Instruction
1. Set up a series circuit as shown in Figure 7.10 (a).
2. Turn on the switch and measure the current that flows through bulb M. Measure the current that flows through bulb N by placing the ammeter between M and N as shown in Figure 7.10 (b).
3. Measure the current that flows through bulb M and N by setting up the circuit as shown in Figure 7.10 (c).
4. Set up the voltmeter across bulb M, followed by bulb N as shown in Figure 7.10 (d) to measure the voltage reading across the bulb.
5. Set up the voltmeter as shown in Figure 7.10 (e) to measure the voltage across two bulbs.
6. Calculate the resistance for each bulb separately and also for both the bulbs using Ohm’s Law.
7. Record all the readings in a table.
Questions
1. What is your conclusion on the current flow through the series circuit?
2. What will happen to the bulbs in the series circuit if one of the bulbs is removed?
Answer:
1. The current that flows through every point is the same.
2. The other bulb does not light up. When one bulb is removed, the circuit is broken.
Aim: To study current, voltage and resistance in a series circuit.
Apparatus: Dry cell holder, connecting wire, bulb (1.5 V), dry cell, switch, ammeter and voltmeter
Instruction
1. Set up a series circuit as shown in Figure 7.10 (a).
2. Turn on the switch and measure the current that flows through bulb M. Measure the current that flows through bulb N by placing the ammeter between M and N as shown in Figure 7.10 (b).
3. Measure the current that flows through bulb M and N by setting up the circuit as shown in Figure 7.10 (c).
4. Set up the voltmeter across bulb M, followed by bulb N as shown in Figure 7.10 (d) to measure the voltage reading across the bulb.
5. Set up the voltmeter as shown in Figure 7.10 (e) to measure the voltage across two bulbs.
6. Calculate the resistance for each bulb separately and also for both the bulbs using Ohm’s Law.
7. Record all the readings in a table.
Questions
1. What is your conclusion on the current flow through the series circuit?
2. What will happen to the bulbs in the series circuit if one of the bulbs is removed?
Answer:
1. The current that flows through every point is the same.
2. The other bulb does not light up. When one bulb is removed, the circuit is broken.