Question

2. The resistance of the bulbs shown in the figure is 12 Ω each. What will the voltmeter read when the first switch is on and both switches are on?

3. The diagram in the figure shows the circuit data. Calculate the amperage of the circuit and the voltage across resistor R5 when:
(a) the switch is on;
(b) the switch is off.

Answer 1

As resistance doesn't affect potential difference voltmeter reading remains 6V

#3

#a

• R=3ohm
• V=9V

So

Apply ohms law

$\\ \rm\rightarrowtail I=\dfrac{V}{R}$

$\\ \rm\rightarrowtail I=\dfrac{9}{3}=3A$

• I is current

#b

Switch is off

• Current=0A