Physics [1 Mark Question Answer]

How does the heat produced by die passage of current in a metallic wire depend on the time of passage of current in the wire?

How does the heat produced by die passage of current in a metallic wire depend on the resistance of the wire.

How does the heat produced by die passage of current in a metallic wire depend on the current in the wire?

Why is the electric power from the generating station transmitted at high voltage?

Which cable, one rated 15A and the other rated 5A will be thicker? Give a reason.

Give two precautious that you would take while putting off an electric switch.

What is the order of current drawn by appliances connected to the ‘power circuit’ of a household?

What is the order of current drawn by appliances connected to the ‘light circuit’ of a household?

An electric bulb is marked 100 W, 230 V. What does this mean?

If the rating of an electric bulb is 100W – 230V, Explain its meaning.

What is ‘Rating’ of an electric appliance?

Which material is the calorimeter commonly made of? Give one reason for using this material.

A device is used to transform 12 V a.c. to 200 V a.c. What is the name of this device? Name the principle on which it works.

Of the three connecting wires in a household circuit: Which two of the three wires are at the same potential? In which of the three wires should the switch be connected?

Why does not the heating coil produce any visible light? in an electric stove.

What is the rating of fuse used in power circuits, in domestic use?

What is the rating of fuse used in light and fan circuits?

‘The current rating of a fuse is 5A’. Comment on this statement.

What is the energy conversion when an electric current passes through a metallic wire?

Two fuse wires of the same lengths are rated 5A and 20A. Which of the two fuse wires is thick and why?

What changes in energy occur in an electric heater?

What changes in energy occur in an electric bulb?

Why is the filament in an electric bulb coiled?

A lady working in her kitchen received a shock from an electric hot plate. What could be the reason for the shock?

What precaution do you observe while connecting a plug top into a socket?

State the position of heating element with respect to principal focus of concave reflector and give reason for choosing this position.

How should the electric lamps in a house be connected so that the switching ON or OFF in a room has no effect on other lamps in the same building?

Why is the heating coil placed in a circular porcelain plate in an electric stove?

Why is heating coil wound in the form of a helix in electric stove?

Explain the meaning of the statement 'the power of an appliance is 100 W'.

What does the unit kilowatt hour measure? Define it.

Why is the fuse wire fitted in a porcelain casing?

An electric heater is rated 220 V, 550 W. Electrical energy is also measured in kWh. What do you understand by a kilo-watt-hour?

An electric heater is rated 220 V, 550 W. What does this statement mean?