Question

An ideal voltmeter V is connected to a 1.5 Ω resistor and a battery with emf 4.7 V and internal resistance 0.5 Ω as shown in the figure. What is the reading on the voltmeter? (Give your answer in decimal using V as unit)

Answer 1

Solution)

Here,

Voltmeter is ideal, so current=0

Terminal Voltage, Vt= E- IR

Vt=4.7 V-0 =4.7 V

Now,

Voltage drop across 1.5 ohm resistor,

V= IR=0

Now, voltmeter reading,

V= 4.7V-0 =4.7 V (Ans)

===========