Question
A battery of emf 12 V and internal resistance 4 ohm is
connected to a resistor. If the current in the circuit is 0.6 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?Solution
Emf of the battery, E = 12V Internal resistance of the battery, r = 4 ohm Current = 0.6 A so, I = E/(R + r) R + r = E/I Â = 12/0.6 = 20 ohm Therefore = 20 - 4 = 16 ohm Terminal voltage of resistor = V so, V = IR => 0.6 x 16 => 9.6 V
A horse cannot pull a cart on a frictionless surface because:
A convex mirror and a concave mirror face each other at a distance of 30 cm. A point object is placed midway. The final image formed by double reflectio...
The wave nature of matter was proposed by:
What process causes white light to split into its constituent colors?
The unit 'Weber' is associated with which of the following?
Which law explains the relation between pressure and volume of a gas at constant temperature? Â
A sudden drop in barometric pressure indicates which of the following?
What will happen to the volume of ozone, when it is heated?
Charges +q and –q are placed at (–d, 0) and (+d, 0). A third charge Q is placed at (0, x). For what value of x will the force on Q be maximum?
An object of mass ‘m’ be made to fall freely from a height ‘h’. At the start the potential energy is _____ and kinetic energy is ______.
...
Relevant for Exams:
