A.C power is transmitted from a power house at a high voltage as
Correct answer: B. It is more economical due to less power loss
- A. The rate of transmission is faster at high voltage
- B. It is more economical due to less power loss
- C. Power cannot be transmitted at low voltages
- D. A precaution against theft of transmission lines
Explanation
B is the correct answer A.C. power is transmitted at high voltage because it reduces the current flowing through the transmission lines. According to the formula P=VI, where P is power, V is voltage, and I is current, power loss in the transmission lines is proportional to the square of the current. By transmitting power at high voltage, the current can be reduced, resulting in lower power losses due to reduced resistive heating in the transmission lines
Last updated
About Electromagnetism
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
Practise Electromagnetism
1,176 free Electromagnetism MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
1 Tesla is equal to:
1 tesla is equal to:
2.5π µF capacitor and 3000-ohm resistance are joined in series to an AC source of 200 volts and frequency. The power factor of the circuit and the power dissipated in it will respectively be:
A 10 cm long solenoid has 100 turns. What will be the magnetic field inside it along its axis if one-microampere current is passed through it?
A 100-turn coil of area 0.1 m2 rotates at half a revolution per second. It is placed in a uniform magnetic field of 0.01 T perpendicular to the axis of rotation of the coil. Calculate the maximum voltage generated in the coil?