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In most transformers, why is the power output is less than the power input.

As some energy is lost as heat/sound meaning the transformer is not 100% efficient
EB
Answered by Ethan B. • Physics tutor
7146 Views

What does it mean to 'earth' something?

When you earth a charged object you're creating a physical path between this object and the ground so it loses its charge. To begin with the object is charged due to having extra or fewer free electrons. Whe...
RJ
Answered by Rhiannon J. • Physics tutor
19031 Views

Explain why an ice cube submerged in a drink melts faster than an ice cube on a kitchen surface (the drink, surface and room temperature are all equal). (3 marks)

(1) In the drink, all six faces are in contact with the liquid (or) On the kitchen surface, only one of the faces is in contact with a solid and the rest are in contact with the air (or) On the kitchen surfa...
AR
Answered by Alistair R. • Physics tutor
2455 Views

How do I remember all the formulas I will need for questions.

It is difficult to remember formulas, especially when they are similar and easy to confuse. Some methods of remembering the many formulas needed for physics and maths are to recite them, to do a lot of pract...
ES
Answered by Elizabeth S. • Physics tutor
2592 Views

If a 60kg girl jumps out of a helicoptor, draw diagrams to show the forces (with values) acting on her when a) she is in freefall, b) she is accelerating at half of g (g = 10 m/s^2), c) she is travelling at a constant speed?

a) 600N arrow down for weight, no air resistance arrow, acceleration = 10m/s^2 b) 600N arrow down, 300N arrow up for air resistance, acceleration = 5m/s^2 (Using F = ma) c) 600N arrows up and down (forces ba...
EJ
Answered by Ella J. • Physics tutor
2551 Views