Large induced voltages are found in camera flashes. For example, a battery may have a no-load voltage of 13 VDC that drops to 12 VDC when a load is applied.\): The familiar security gate at an airport not only detects metals, but can also indicate their approximate height above the floor. It will have a certain "no-load" voltage that usually drops when a load is applied. The same thing happens to sources of electrical energy. As you started to climb a hill you will experience an increased load and start to slow down. Suppose you are riding a bicycle on a level road. This is often called voltage.įorgive me as I add an analogy that would appear not to belong. We would say the the meter is measuring the potential difference between the two points. It could be a battery, solar cell, or coil of wire as shown in this video. It does not matter what is being measured. The red probe goes to one part of the circuit and the black probe goes to another. If you have a voltmeter in had you could measure voltage as the difference between any two point in a circuit. Here is an answer from an electrical engineer's perspective - it may not line up with a physicists answer.
So induced current always flows in a direction that oppose the motion of the magnet.This is Lenz's law. This is not possible (law of conservation of energy). If in case the induced current promotes the motion of the magnet, it stars moving at a faster rate and the electric energy(induced) and kinetic energy(of the magnet) starts increasing, without any work done. The work done in moving the magnet towards the coil is converted into electrical energy, which gets dissipated into heat energy.The current flows in a direction to oppose the motion of the magnet. The direction of the induced current is found from Lenz' law as follows. Now we know that as the magnet moves through the coil magnetic flux linked with the coil changes inducing a current.
If the magnet is withdrawn from the coil upper end acquires south polarity, so work is done against the force of attraction. Upper end of the coil acquires north polarity, hence work is done against the force of repulsion to move the magnet. Consider that the magnet's north pole moves towards the coil.
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