Science : Ch 12 – Electricity

A boy records that 4000 joule of work is required to transfer 10 coulomb of charge between two points of a resistor of 50 Ω. The current passing through it is:

Two resistors are connected in series gives an equivalent resistance of 10 Ω. When connected in parallel, gives 2.4 Ω. Then the individual resistance are

A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. The rating of fuse to be used is:

A cell, a resistor, a key, and an ammeter are arranged as shown in the circuit diagrams. The current recorded in the ammeter will be:

Insulators consists of:

True test of charge is

Electrical resistivity of a given metallic wire depends upon:

The formula which states the relation between potential diference, current and resistance

What is the maximum resistance which can be made using five resistors each of 1/5 W?

The electrical resistance of a conductor having cross-sectional area 1 m² and length 1m

S.I unit of resistivity

The rate at which electrical work is done or the rate at which electrical energy is consumed

The equivalent resistance of a series combination of two resistances is X Ohm. If the resistance are of 10 Ohm and 40 Ohm respectively, the value of X will be:

The maximum resistance which can be made using four resistors each of 2 Ohm

The device used to measure the internal resistance of a cell, to compare the e.m.f. of two cells and potential diference across a resistor