TEST YOURSELF

State the factors on which the internal resistance of the cell depends.

In the given figure, the lightning arrangement is protected by $3 \mathrm{A}$ fuse.

(i) When the $200 \mathrm{W}$ lamp $\text{'}\mathrm{A}\text{'}$ is switch on, what current does it draw?

In the given figure, the lightning arrangement is protected by $3 \mathrm{A}$ fuse. What current flows through the fuse when all the lamps are switched on?

In the given figure, the lightning arrangement is protected by $3 \mathrm{A}$ fuse. How many units of energy will the system consume, if all the lamps are on for $20$ hours?

In the given figure, the lightning arrangement is protected by $3A$ fuse. What would happen, if all the lamps were replaced by $200 \mathrm{W}$ lamps and they all are switch on?

 Which electric bulb has greater heat production, a $100 \mathrm{W}$ or a $200 \mathrm{W}$? Assume that both of them are connected to the same supply.

Calculate the amount of heat produced per second in calories when a bulb of $50 \mathrm{W}$, $200 \mathrm{V}$ glows. Assuming that only $16\%$ of the electric energy is converted into light. Take$1 \mathrm{cal}=4.2 \mathrm{joule}$.

A wire of uniform thickness with a resistance of $27 \mathrm{\Omega }$ is cut into three equal pieces, and they are joined in parallel. Find the resistance of the parallel combination.