By Kenneth Munson
HARDBACK publication approximately WW 2 BOMBERS.
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Additional resources for Bombers in Service: Patrol and Aircraft Since 1960
Constant current like this is called direct current. This name is often shortened to DC. DC always flows in the same direction, from positive to negative. At one instant, the terminal is 1 V positive of the other. Then the voltage decreases until it is 1 V negative of the other terminal. Then it swings back again to become 1 V positive. This cycle is repeated indefinitely. The effect of this reversing voltage on the current in a circuit is shown below: Memo As usual, we are thinking of current as conventional current (p.
It has a period P = 1 s. If we plot a graph of the sine of an angle from 0º to 360º, it has exactly the same shape as one cycle of the AC graph. The AC has a sinewave shape. Not all AC has this shape, but this is the commonest. The mains AC and any AC from mains transformers are sinewaves. Frequency The unit of frequency is the hertz. Its symbol is Hz. The hertz is defined as a frequency of one cycle per second. The AC waveform shown in the graph has a frequency of 1 cycle per second, or 1 Hz. If the period of a waveform is P seconds, there are 1/P cycles in one second.
15 Write an equation that shows how the three units of Question 14 are related to each other. 5 V cells in a battery box. 13) are also joined in series. 16 What are the units and symbols for (a) a millionth of a volt, and (b) a million watts? 17 A halogen lamp runs on 12 V with a power of 20 W. How much current does it take? 18 A small radio receiver uses two alkaline cells and takes a current of 12 mA. What is its power? 19 Draw a diagram to illustrate 4 cycles of AC. Label the amplitude and the period.