Electricity-Important Questions

1.  What is the difference between a conductor and an insulator?

2.  What is the difference between open and closed circuits? Draw diagrams for both.

3.  Define parallel connection and series connection.

4.  What are the disadvantages of heating effect of current?

5.  What are the advantages of heating effect of current?

6.  What is electric current?

7.  What is potential difference? Give its unit with definition.

8.  Find the expression for calculating heat.

9.  A wire is 1m long, 0.2mm in diameter and has resistance of 10Ω. Calculate its resistivity.

10.  Calculate the area of cross section of a wire of length 2m, its resistance is 25Ω and the resistivity of material of wire is 1.84*10^-6 Ωm.

11.  Calculate the energy consumed by 120W toaster in 20 minutes.

12.  What is resistance of conductors? Name two metals which are highly resistant.

13.  Why is tungsten metal used in bulbs but not in fuse wires?

14.  Define the terms Watt and Volt.