Question
State the principle of a transformer.
✓
Answer
It is based on the principle of 'electromagnetic induction'. The magnitude of induced e.m.f. is given by the formula.
$
\frac{\text { No. of turns in primary coil }}{\text { No.of. turns in secondary coil }}=\frac{\text { E.m.f. in primary }}{\text { E.m.f in secondary }}
$
Neglecting power losses
Elective power fed in the primary (input) = Elective power produced in secondary (output)
or $E _{ p } \times i _{ p }= E _{ s } \times i _{ s }$
$
\frac{E_p}{E_s}=\frac{i_s}{i_p}
$
$
\frac{\text { No. of turns in primary coil }}{\text { No.of. turns in secondary coil }}=\frac{\text { E.m.f. in primary }}{\text { E.m.f in secondary }}
$
Neglecting power losses
Elective power fed in the primary (input) = Elective power produced in secondary (output)
or $E _{ p } \times i _{ p }= E _{ s } \times i _{ s }$
$
\frac{E_p}{E_s}=\frac{i_s}{i_p}
$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
State a relation between electrical power, resistance and potential difference in an electrical circuit.
A string stretched between its ends is made to vibrate by placing the stem of a vibrating tuning fork at its one end. State three ways how you will increase the frequency of note produced by the string.
Define the term 'focus' of a lens.
(a) Fig represents an incomplete diagram of a simple string pulley system. Copy this diagram on a new page and complete it and mark where the effort must be applied to lift the load.
(b) What is the velocity ratio of this system?
(c) If the pulley system is 80% efficient and the load is 720 N, then
(i) What effort must be applied to lift the load?
(ii) What work must be done must be done in lifting the load through a distance of 2 m using this machine?
(b) What is the velocity ratio of this system?
(c) If the pulley system is 80% efficient and the load is 720 N, then
(i) What effort must be applied to lift the load?
(ii) What work must be done must be done in lifting the load through a distance of 2 m using this machine?
Where are the cartridge type fuse used?
Does the specific heat capacity of a substance depend upon its mass and rise in temperature only?
What is a pulley?
What are infrared radiations? How are they detected? State one use of these radiations.
Draw the ray diagrams of a converging lens, when the object is placed at a distance greater than twice the focal length of the lens.
If a ray of light passes from medium I to medium II without any change of direction, what can be said about the refractive indices of these media (angle I is not 0)?