What is the effect on the current in a wire if
both the voltage across it and its resistance
are doubled?
1. The current does not change.
2. The current is 4 times bigger.
3. The current is doubled.
4. The current is reduced to a quarter of its
original value.
5. The current is halved.
6. It cannot be determined.

Question

13-01-2024
Physics

contestada

What is the effect on the current in a wire if
both the voltage across it and its resistance
are doubled?
1. The current does not change.
2. The current is 4 times bigger.
3. The current is doubled.
4. The current is reduced to a quarter of its
original value.
5. The current is halved.
6. It cannot be determined.

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jpshindell13 jpshindell13 · Answer 1 · 2024-01-13T04:53:21+01:00

The correct answer is number 2 - the current is 4 times bigger.

If both the voltage across the wire and its resistance are doubled, the current will increase. This is because the current through a conductor is directly proportional to the voltage across it, and inversely proportional to its resistance.

When the voltage is doubled, the current will also double. And when the resistance is doubled, the current will be halved. However, since both the voltage and resistance are doubled in this scenario, the overall effect is that the current will be twice the original value in each case, resulting in a current that is 4 times bigger than the original current.