List of top Science Questions on Electrical Circuits

State the role of an electric fuse, used in series with an electrical appliance. Why should in an electric circuit a fuse with defined rating not be replaced by one with a larger rating?
An electric bulb is rated 220V, 11W. The resistance of its filament when it glows with a power supply of 220V is:
The minimum number of identical bulbs of rating 4V, 6W, that can work safely with desired brightness, when connected in series with a 240V mains supply is:

In the circuit given below, five resistances of \(10 \Omega\), \(40 \Omega\), \(20 \Omega\), \(30 \Omega\), and \(60 \Omega\) are connected as shown to a battery of 18 volts.
Potential difference between points A and B

In the circuit given below, five resistances of \(10 \Omega\), \(40 \Omega\), \(20 \Omega\), \(30 \Omega\), and \(60 \Omega\) are connected as shown to a battery of 18 volts.
Total resistance of the circuit

In the circuit given below, five resistances of \(10 \Omega\), \(40 \Omega\), \(20 \Omega\), \(30 \Omega\), and \(60 \Omega\) are connected as shown to a battery of 18 volts.
Total current flowing in the circuit

Symbols of few components used in electrical circuits are given in column A. Match with names given in column B and choose the correct option:

In the given circuit, find the equivalent resistance between A and B and potential difference between the ends of the 5 \(\Omega\) resistance.

In the given circuit, find: 
(i) Total resistance 
(ii) Current through the cell, and 
(iii) Potential difference across 0.8 \(\Omega\) resistance. 

Explain clearly the arrangement for a domestic electric circuit with the help of a diagram.
Two wires of resistances R and 2R are joined first in series and then in parallel. If the total resistances in the two conditions are \( R_1 \) and \( R_2 \) respectively, then \( R_1 / R_2 \) will be:
The resistance of a wire of any substance of length \( l \) and area of cross-section \( A \) is 4 \( \Omega \). Another wire of the same substance has length \( 2l \) and area of cross-section \( \frac{A}{2} \). Then its resistance will be
Which of the following does not represent electrical power in a circuit?
How can the three resistances 2 Ω, 3 Ω, and 6 Ω be connected, so that (i) total resistance of 4 Ω is obtained, and (ii) total resistance of 1 Ω is obtained?
Write the name, (ii) working, and (iii) colours of the insulation of the wires used in the domestic electrical distribution.