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Can someone answer this question?
A student connects a circuit that contains a battery, a switch, and a LED lamp.
(a) in which parts would expect to observe a voltage gain, and in which parts would you expect a voltage drop?
(b) Is there any part in the circuit where you would expect no voltage drop or gain? Explain your reasoning.
2 Answers
- Coffee DrinkerLv 72 years ago
The battery provides a voltage gain. That's its primary purpose, to add voltage to a circuit where there would otherwise be no voltage and therefore no flow of electricity.
The light bulb creates a voltage drop. The energy is converted into light (and some heat, but not very much heat because its LED instead of an incandescent bulb.
The switch and wires should have no measurable voltage drop or gain since their primary purpose is to conduct electricity and they offer (almost) no resistance. Technically they have some resistance and cause some amount of voltage drop, but its such a small amount that you can just ignore it.
- Steve4PhysicsLv 72 years ago
Assuming switch is on:
Voltage gain across battery because battery supplies electrical energy. (Chemical energy turned to electrical energy).
Voltage drop across LED because LED use electrical energy. (Electrical energy turned to light and some heat.)
No voltage change across switch because switch neither supplies nor uses electrical energy.
