Why heat is generated across a resistor when the electric field is applied?
The energy that can be extracted from a storage battery is always less than the energy that goes into it while charging. Why?
Water boiled in an electric kettle for 15 minutes after being switched on. Using the same main supply, should the length of the heating element be increased or decreased if the water is to boil in 10 minutes. Explain.
The resistance of ammeter must essentially be very small. Why?
An ammeter is always connected in series. Why?
Two bulbs of different wattage are connected in series. Which bulb will glow brighter? Why?
Given an example of a non-ohmic conductor and present its current-voltage characteristics.
When the ends of a wire are connected to a battery, initially the current is slightly larger, but soon it decreases slowly and becomes steady at a lower value although the emf of the battery remains unchanged. Explain.
Two coppers wires of different diameters are joined end-to-end. If a current flows in the wire combination, what happens to the drift velocity of the electrons when they move from the larger-diameter wire to the smaller-diameter wire?
"Good thermal conductors are also good electrical conductors". If so, why dont't the conencting wire that are used to connect heaters get hot by conduction of heat from the heating element?
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