Which one of the following is true according to Ohm's law?
Resistance increases as current increases.
$I \rightarrow V$ graph is linear.
Resistance increases as voltage increases.
Current increases as resistance increases.
From the listed electrical devices, which releases heat energy that is not appreciated?
A bulb gets dimmer for a moment when a geyser, connected across the same source is switched on. Why ?
The applied potential difference across a given resistor is altered so that the heat produced per second increases by a factor of $16.$ By what factor the applied potential difference changes.
Why is very less heat generated in long electric cables than in filaments of electric bulbs ?
Silicon is $......$