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Voltage is a relative measurement, comparing one point in a circuit to another, which is why you sometimes see voltage called voltage drop, potential difference, or potential drop. The voltage at any point in a circuit is always relative to the voltage at some other point – usually the negative terminal of the battery. An analogy that may help you understand: measuring voltage is much like measuring distance. ’ On the other hand, you may say, ‘I’m five miles from home’, stating your distance from a reference point (home).

On the other hand, you may say, ‘I’m five miles from home’, stating your distance from a reference point (home). 5 volts with respect to ground’, that makes perfect sense. 5 volts is dropped across the light bulb. ) The important thing to notice here is that as you travel around a DC circuit, you gain voltage going from the negative terminal of the battery to the positive terminal (that’s known as a voltage rise), and you lose or drop voltage as you continue in the same direction across circuit components.

It may get that signal from your broadcast TV provider or the output of another electronic device, such as a DVD player). Electronic components within the set decode that electrical signal and apply the information carried by the signal to control the colour and intensity of each pixel. Different types of TVs activate display pixels in different ways. For example, the electronics in a colour CRT TV steers three separate electron beams, positioning them to strike coloured phosphors on the inside surface of the screen.