What is the importance of insulators in household wiring?

Write Faraday's laws of electromagnetic induction. Mention one advantage of using a LED lamp over an incandescent lamp. [2 + 1]

If the same potential difference is applied between the two ends of iron and copper wires having the same length and cross section, does equal amount of current flow through the two wires?

If a current of 0.2 ampere flows through a conductor of resistance 40 ohm, what is the potential difference between the two ends of the conductor? 0.5 volt 2 volt 6 volt 8 volt

A thin wire of resistance 4 Ω is bent to form a circle. Find the resistance across any diameter.

If 12 C of charge flows through a conductor for 2 minutes, the electric current is (a) 6 amperes (b) 0.1 amperes (c) 24 amperes (d) 10 amperes

What is DC?

Two metallic wires A and B of the same length are made of the same material. The radius of wire A is double the radius of wire B. What is the ratio of resistances of the two wires? [3] OR There are three 220V-60W electric lamps and two 220V-100W electric fans in the house. The electric lamps are lit for 5 hours a day and the fans are run for 10 hours a day. If the cost per B.O.T unit is Rupees 5, what will be the cost of electricity for 30 days? [3]

Establish the relationship between internal resistance and EMF of an electric cell.

If two conductor wires of resistances 6 ohms and 4 ohms are connected in parallel combination, what will be the equivalent resistance of the combination?

Give the definition of electromotive force of an electric cell in open circuit.

The series combination of three 20 Ω resistances is connected in parallel combination to a 30 Ω resistance. Determine the equivalent resistance of the final combination.