Advertisements
Advertisements
Question
State two causes of energy loss in a transformer.
Advertisements
Solution
Causes of energy loss in a transformer:
1) Eddy currents developed in the core.
2) Hysteresis loss because of repeated magnetisation and demagnetisation of the iron core.
APPEARS IN
RELATED QUESTIONS
Name the law which relates the current in a conductor to the potential difference across its ends.
A current of 200 mA flows through a 4 kΩ resistor. What is the p.d. across the resistor?
The following table shows current in Amperes and potential difference in Volts.
Which law will the graph prove? Explain the law.

Five resistors of different resistances are connected together as shown in the figure. A 12 V battery is connected to the arrangement.

Calculate:
(i) the total resistance in the circuit
(ii) the total current flowing in the circuit.
A current of 0.2 A flows through a conducting wire for 5 minutes. How much charge will flow?
A current of 100 mA. flows through a wire. The charge on an electron is 1.6 × 10-19 C. Find the number of electrons passing per second through the cross-section of the conductor.
A 10 m long wire of a particular material is of reistance 5Ω What will be the resistance of 5m long wire of same material and the same thickness.
Conceptual question.
A bird sitting on a high power electric line is still safe. How?
State Ohm’s law.
A boy records that 4000 joules of work are required to transfer 10 coulombs of charge between two points of a resistor of 50 Ω. The current passing through it is:
