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View attachment 44307
What does this mean? Please explain. sorry for the two posts. I couldnt remove it View attachment 44307 View attachment 44307
We have to look quite hard to get the answer - why does the current seem to prefer the train rather than the relay? Note that a relay should have a low resistance to ensure maximum current flowing through it (and this causes the electromagnetic effect that turns the switch on or off).
So if current prefers the train rather than the relay, then shouldn't the train have an even lower resistance than the relay?
This resistance is practically Zero, since the train is preferred over a relay coil.
Therefore, without the resistor, the current would just flow out of the positive terminal and back into the negative terminal, short-circuiting the circuit. So, to ensure this does not happen, a resistor is placed in series with the train connection (the tracks) which will dispense of most of the energy supplied by the battery whenever the train is on the track.
Hope this helped!
Good Luck for all your exams!
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