Work, Energy and Power (A level)

Work is done when a force moves the object in the direction of the force and is given by the product of the force and the distance moved in the direction. W = Fs , Where W= Work, F = Constant Force (N), S = Distance moved in the direction of the force (m) SI Unit for work is joules …

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A Level Physics

Revision notes for A level Physics coursework (H1 and H2): For each topics, there are A level revision questions with worked solutions that you can attempt. The notes available here are great for revision and studying on the go. The A Level Physics content here is equivalent to the Physics required for Advanced Placement. If this is too advanced for you, you …

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Reading Kinematics Graphs

Distance-Time Graphs For a distance-time graph, the distance never decreases. When the object is stationary, the distance-time graph will be horizontal. The gradient of a distance-time graph is the instantaneous speed of the object. For straight line with positive gradient, it means that the object is travelling at uniform speed There is no straight line with negative gradient (as the …

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Workings of a Transformer

A transformer is a device that changes a high alternating voltage at low current to a low alternating voltage at high current or vice versa. Structure of transformer: Primary coil: Connected to primary input voltage ($V_{p}$) with turns ($N_{p}$) Secondary coil: connected to load with output voltage ($V_{s}$) with turns ($N_{s}$) Soft-iron core: The coils are wound around a laminated …

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Principles Of Electromagnetic Induction

Faraday’s Law of Electromagnetic induction is the process in which an electromotive force (emf) is induced in a closed circuit due to changes in the magnetic field around the circuit. Lenz’s law states that the direction of the induced e.m.f. and hence the induced current in a closed circuit is always such as to oppose the change in magnetic flux …

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Workings Of D.C. Motor

In order to understand how a D.C. motor works, we will need to learn how a current-carrying coil generates turning effect in a magnetic field. Turning effect of a current-carrying coil in a magnetic field The coil is placed horizontally between two magnets as shown in the figure above. The magnetic field points from the N to S. Using Fleming’s …

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