What is the unit of resistance?
coulomb
Joule
ohm
volt
What is meant by resistance ?
Why should the melting point of a fuse wire be low ?
Define electric current and state its $SI$ unit. With the help of $Ohm's$ law explain the meaning of $1$ ohm resistance
The following table gives the resistivity of three samples
Sample | $A$ | $B$ | $C$ |
Resistivity | $1.6 \times 10^{-8} \Omega m$ | $5.2 \times 10^{-8} \Omega m$ | $100 \times 10^{-6} \Omega m$ |
Which of them is suitable for heating elements of electrical appliances and why ?
How can we measure the current in a circuit ?