What current flowing through a resistance coil of 10 ohm would produce 70 cal/min? J = 4.2 J/cal.

Solve the cross-word. Across 2. A combination of resistances that reduces effective resistance of the circuit. 4. It is the rate of flow of charge. 6. Substance which does not allow current to flow through it. Down: 1. Combination of resistances in. which current flowing through all resistances is same. 3. Ratio of potential difference and current. 5. It is used to protect domestic appliances.

true or false: 1J = 4.18 cal

An electric current of 5 A flows through a wire of resistance 41.8 ohm Find the time to obtain heat of 3000 cal.

Due to 10 A of current flowing in a circular coil of 10 cm radius , the magnetic field produced at its centre is 3.14 xx 10^-3Wb//m^2 .The number of turns in the coil will be

A copper wire of resistance 100 Q is connected to a battery of potential difference 25 V. What will be the current flowing through the wire? If the wire is replaced by aluminium wire, the current flowing through it decreases by 0.05 A. What is the resistance of aluminium wire used?

An ammeter gives full deflection when a current of 2 amp . Flows through it. The resistance of ammeter is 12 ohms . If the same ammeter is to be used for measuring a maximum current of 5 amp , then the ammeter must be connected with a resistance of

Solve the following examples/ numerical problems. Find the heat produced in joule if a current 0.1 A is passed through a coil of resistance 50 ohm. for two minutes . Keeping other conditions the same if the length ofthe wire is reduced 1/4 th of the original length ( by cutting the wire). What will be the heat produced?

Solve the following examples/ numerical problems. Calculate the heat produced in calorie when a current of 0.1 A is passed through a wire of resistance 41.8 ohm for 10 minutes.

The potentiometer wire has length 10m and resistance 10Omega , if the current flowing through it is 0.4A, what are the balancing lengths when two cells of emfs 1.3V and 1.1V are connected so as to:- assist and

The potentiometer wire has length 10m and resistance 10Omega , if the current flowing through it is 0.4A, what are the balancing lengths when two cells of emfs 1.3V and 1.1V are connected so as to:- oppose each other?