n identical light bulbs, drawing P power from voltage supply, are joined in series. The total power drawn is

Electric power can be defined as the rate at which work is done or energy is converted into an electrical circuit. It is basically a measurement of energy used in a span of time.

Step 1: Use of Formula

In order to calculate, we need to use the formula of electric power, which is given by:

P = VI

Here,

P = Power
V = Potential difference in Circuit
I = Electric Current

Power can be represented as:

⇒ P = I²R
⇒ $P = {{V^2} \over R}$

The two expressions were obtained by using Ohm’s Law, wherein Voltage, Current, and Resistance are all interrelated with one another. Ohm’s Law is given by:

V = IR

Where,

R = Resistance in the Circuit
V = Potential difference
I = Electric Current

Step 2: Find Solution

Let’s first consider the following readings:

A voltage of the source = V
Resistance of each bulb = R

Hence, $R = {{V^2} \over P}$

The amount of Power drawn by each bulb can be given by = i²R = ${{V^2} \over n^2R^2} \times R$

=${{V^2} \over n^2R} $

= ${{P} \over n^2}$

Read Also: Ohm’s Law and its Limitations

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n identical light bulbs, drawing P power from a voltage supply, are joined in series. The total power drawn is

Step 1: Use of Formula

Step 2: Find Solution

CBSE CLASS XII Related Questions

4.
A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

6.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

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n identical light bulbs, drawing P power from a voltage supply, are joined in series. The total power drawn is

Step 1: Use of Formula

Step 2: Find Solution

CBSE CLASS XII Related Questions

4.A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

6.Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

4.
A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

6.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?