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As given by Ohm's Law Resistance is the ratio of voltage to current in a circuit. Resistance is measured in Ohms, frequently abbreviated as Ω.

Resistance resists electrical flow, just like a steep hill slows a car's speed. If you think of amperage as the weight of a car and resistance as the steepness of the hill, then voltage is the amount of horse-power needed to get up that hill. So the same horse power could get a smaller car up a larger hill than it could a large truck. The behavior of electricity is similar.

1 volt can push 1 amp through 1 ohm of resistance. That same 1 volt can only push 1/2 amp through 2 ohms of resistance. 2 volts would be needed to push that same 1 amp through the 2 ohms of resistance.


Say you have a circuit that is rated as a maximum of 5 volts. What is really happening is that the circuit has a resistance of 50 ohms, and therefore can only take 1/10th of an amp before it burns out. So anything more than 5v would push too much current (amps) through the circuit.

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NOTE: All information contained within this article is pure opinion. Although this article is intended to help people, it may contain faulty or misleading information. This article is not to be considered professional opinion or advice, and is in no way a replacement for reading all safety/instructional documentation. Always remember to protect yourself when handling/using hazardous materials, as well as test new techniques before using them on projects/work intended to be handed in or used.

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