Search results
Apr 30, 2024 · Revision notes on 7.2.4 Electric Motors for the AQA GCSE Physics syllabus, written by the Physics experts at Save My Exams.
In this GCSE Physics Revision Guide, you will find high quality Electric Motors GCSE Revision Notes and Past Paper Questions.
- How Do Cranks Work?
- How Do Cams Work?
- Examples of Cranks
- Examples of Cams
- Force Or speed?
Engines that make their power with pistons usually need a way of converting back-and-forth (reciprocating) motion into round-and-round (rotational) motion—a way of driving a wheel, in other words. Most engines use cranks to do this. A crank is simply an off-center connection that provides energy to (or takes energy from) a rotating wheel. As the cr...
Cams generally do the opposite job to cranks: they turn rotary motion into reciprocating motion. Whatever you need to move up and down (or back and forth) rests on top of an oval wheel, sometimes mounted off-center (the cam). As the cam rotates, the object it supports rises up and down. In this example, you can see the blue box rises and falls as t...
It's all very well to talk about things in theory with little animated graphics, but it's muchmore interesting to see how these things work in actual machines. The following selection of photosshows you some examples of cranks working hard in real life.
From door locks and prosthetic legs to old-fashioned (gear-driven)calculators and photocopiers, cams are working theirmagic inside all kinds of machines, turning rotation into back and forth motion. It's almost impossible to find good pictures of working cams, but I'm constantly looking out for examples; I'll post more here as I discover them.
Cranks are closely related to levers and gears: all three of these can be used to magnify force or speed, although not both at the same time. Suppose you're turning the handle of the clockwork radio in our top picture. Your hand goes round in a larger circle than the mechanism in the center, so it's traveling faster. A crank used in this way reduce...
Oct 1, 2024 · Revision notes on Electric Motors for the Cambridge (CIE) IGCSE Physics syllabus, written by the Physics experts at Save My Exams.
Learn about and revise electromagnetism, the motor effect and its applications in motors with GCSE Bitesize Physics.
Electric Motors. When a coil of wire carries an electric current in a magnetic field, it experiences a force that can cause the coil to rotate. This is how electric motors function. The diagram below shows a simple DC electric motor. We use a coil of wire that is free to rotate between two opposite magnetic poles.
People also ask
Why do engines use a crank?
How do electric motors work?
How does a DC electric motor work?
How does a crank work in a generator?
What does a crank do in a car?
How do cranks and cams work?
In the of this series concerning slider and crank mechanisms we firstly found from geometry an expression for displacement x of the slider as a function of crank angle θ and the ratio n (= L/R) and then differentiated with respect to time to obtain expressions for velocity and linear acceleration also as functions of θ and n.
