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GCSE Physics - Physics4IGCSE
GCSE Physics - Physics4IGCSE

Figure 1 - Typical electronic package
Figure 1 - Typical electronic package

... Since the currents on the input and output wiring vary with time, they generate electromagnetic waves. This radiated interference may cause undesirable effects on nearby circuitry or equipment. FCC and European test specifications measure this interference with an antenna / receiver combination 10 m ...
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... 1. I can describe a force as a push or a pull and that the unit of force is the newton which has the symbol N. 2. I know that forces can change the speed, direction and/or shape of an object. 3. I can explain the difference between a contact and a non-contact force and give examples of each. 4. I ca ...
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Alternating current



Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC, also dc), the flow of electric charge is only in one direction. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.AC is the form in which electric power is delivered to businesses and residences. The usual waveform of alternating current in most electric power circuits is a sine wave. In certain applications, different waveforms are used, such as triangular or square waves. Audio and radio signals carried on electrical wires are also examples of alternating current. These types of alternating current carry information encoded (or modulated) onto the AC signal, such as sound (audio) or images (video).
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