Question

two resistances 500 ohm and 1000 ohm are connected in series with a of 1.5V. the voltage across the 1000 ohm resistance is measured by a voltmeter having resistance of1000 ohm. The reading in the voltmeter would be

Answer 1

Answer:

The reading in the voltmeter will be : 1.0 Volt

Explanation:

Let R1 = 500 ohm

     R2 = 1000 ohm

     V = 1.5 V

Since the two are connected in series their equivalent resistance will be given by R = R1 + R2

substituting the values of R1 & R2

R = 500 + 1000

R = 1500 ohm.

Now we know that by Ohm's law

V = IR

rearranging the equation to find the current in the circuit

I = V/R

substituting the values of V and R

I = 1.5/1500

I = .001 A

In a series circuit the current in the Circuit is the same at any point.

To calculate the Voltmeter reading across 1000 ohm resistor using the same formula V = IR

lets suppose here V = V2 (as V2 is the potential difference across resistor R2) & R = R2

V2 = IR2

Substituting the values of I & R2

V2      = 0.001 × 1000

V2     = 1 volt