Consider the current flowing through bulb 5. 1. All switches are closed, then sw

Question

Consider the current flowing through bulb 5.

1. All switches are closed, then switch 1 is opened. Does the current through the bulb increase, decrease, or stay the same?

2. All switches are closed, then switch 2 is opened. How does the current through bulb 5 change?

3. Then switch 1 is also opened. How does the current through bulb 5 change?

4. Finally, switch 3 is opened as well. How does the current through bulb 5 change now?

Consider the current flowing through bulb 5. 1. All switches are closed, then switch 1 is opened. Does the current through the bulb increase, decrease, or stay the same? 2. All switches are closed, then switch 2 is opened. How does the current through bulb 5 change? 3. Then switch 1 is also opened. How does the current through bulb 5 change? 4. Finally, switch 3 is opened as well. How does the current through bulb 5 change now?

Explanation / Answer

All switches are closed. When the switch 1 is opened, then the effective resistance cross the bulb 5 will be increased. Hence, using the ohm law, the current is indirectly proportional to the resistance.

Hence, the current through the bulb decreases.

2. When switch 2 is open, then the effective resistance cross the bulb 5 will be increased. Hence, using the ohm law, the current is indirectly proportional to the resistance.

Hence, the current through the bulb decreases.

3. When both switch 1 and 2 are open, and then the effective resistance of the bulb is not changed. Hence, the current in bulb stay the same.

4.When both switch 1, 2 and 3 are open, and then the effective resistance of the bulb is not changed. Hence, the current in bulb stay the same.

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---