Electro-Magnetism — Physics STD 10 — Question

What is an ideal machine?

What does the unit kilowatt hour measure? Define it.

Name the type of energy (kinetic energy K or potential energy U) possessed in the given cases:
A moving bus

Write the SI units of energy.

Relate 1 KWh (kilowatt hour) with joule.

Why is the loudness of the sound heard by a plucked wire increased when it is mounted on a sound board?

At what voltage and frequency is the electric power generated at the power generating station?

State two factors on which the strength of an induced current depends.

A boy of mass m climbs up a staircase of vertical height h. What is the work done by the boy against the force of gravity? What would have been the work done if he uses a lift in climbing the same vertical height?

Define potential energy.