For a fixed resistor, increasing the supply voltage will cause the current to do what?

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Study for the Amtrak Signal Maintenance Training Level 1 Test. Prepare with flashcards and multiple-choice questions. Each question comes with hints and explanations. Get ready for your exam!

Multiple Choice

For a fixed resistor, increasing the supply voltage will cause the current to do what?

Explanation:
Ohm's law shows that current is proportional to voltage when the resistance stays the same. For a fixed resistor, R is constant, so I = V/R. That means if you increase the supply voltage, the current rises in direct proportion to that voltage. For example, doubling the voltage doubles the current because the resistance hasn’t changed. This also means power dissipation P = VI increases as voltage increases, reinforcing why current must increase with higher voltage.

Ohm's law shows that current is proportional to voltage when the resistance stays the same. For a fixed resistor, R is constant, so I = V/R. That means if you increase the supply voltage, the current rises in direct proportion to that voltage. For example, doubling the voltage doubles the current because the resistance hasn’t changed. This also means power dissipation P = VI increases as voltage increases, reinforcing why current must increase with higher voltage.

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