Electric Power and House hold Circuits Physics - Electric Power and House hold Circuits

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.

What is the resistance of an appliance rated at V volt, P watt?

How can electric energy consumed by an electric appliance be calculated in kilowatt hour (kWh)?

An electric kettle is rated 3kW, 250V. What should be the current capacity of the fuse with it?

A family uses a light bulb of 100W, a fan of 100W, and a heater of 1000W, each for 8 hours a day. If the cost of electricity is Rs. 2 per unit, what is the expenditure to the family per day, on electricity?

Out of the three fuses with current ratings 5A, 10A, 15A, which one is to be connected in a geyser circuit marked 3 kW, 220V? Give reason for your answer.

An Electric bulb is marked 100 W, 230 V. What how long would this lamp take to consume one unit of electricity?

An electric iron is rated at 230 V, 750 W. What is its resistance? What maximum current can be passed through it?

State one advantage of using a.c. over d.c.

Name the markings of a three-pin plug. Give the colour codes of the connecting leads.

Two sets A and B of four bulbs each are glowing in two separate rooms. When one of the bulbs in set A is fused, the other three bulbs also cease to glow. But in set B, when one bulb fuses the other bulbs continue to glow. Explain the difference.

Two bulbs are rated: bulb A 100W, 120 V bulb B 10 W, 120 V. If both are connected across a 120V supply, which bulb will consume more energy, When in parallel? Also calculate the current through each bulb in the above cases.

Two bulbs are rated: bulb A 100W, 120 V bulb B 10 W, 120 V. If both are connected across a 120V supply, which bulb will consume more energy, When in series? Also calculate the current through each bulb in above cases.