Resistances in series and parallel

Calculate the resistance of two coils if their equivalent resistance in series and parallel are respectively 18 Omega and 4 Omega

Under what condition will the current in a wire be the same when connected in series and in parallel on n identical cells each having internal resistance r and external resistance R?

A technician has only two resistance coils. By using them in series or in parallel he is able to obtain the resistance 3,4,12 and 16 ohm. The resistance of two coils are

Resistance of 100 Omega and 200 Omega are connected in series with 220 V mains. When a voltmeter of 1000 Omega resistance is connected in parallel to 100 Omega , then the reading of voltmeter is

The n rows each containinig m cells in series are joined parallel. Maximum current is taken from this combination across jan external resistance of 3 Omega resistance. If the total number of cells used are 24 and internal resistance of each cell is 0.5 Omega then

An ammeter and a voltmeter are joined in series to a cell. Their readings are A and V respectively. If a resistance is now joining parallel with the voltmeter. Then

Two resistance connected in parallel across a cell of negligible internal resistance, use 4.5 times the power that they would use, when in series across the same cell. If one of the resistance is 8ohm, the other is:-

Distinguish between Series and parallel circuit

A 5Omega resistor is connected in series with a parallel combination of n resistors of 6Omega each. The equivalent resistance is 7Omega . Find n

A galvanometer of resistance 30Omega is connected to a battery of emf 2 V with 1970Omega resistance in series. A full scale deflection of 20 divisions is obtained in the galvanometer. To reduce the deflection to 10 divisions, the resistance in series required is