How will a current change if the resistance of a circuit remains constant while the voltage across the circuit decreases to half its original value?
1. the current will drop to half of its original value.
2. it is impossible to predict.
3. the current will triple.
4. the current will remain the same.
5. the current will double.
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Ответ:
1. The current will drop to half of its original value.
Explanation:
The problem can be solved by using Ohm's law:
where
V is the voltage across the circuit
R is the resistance of the circuit
I is the current
We can rewrite it as
In this problem, we have:
- the resistance of the circuit remains the same: R' = R
- the voltage is decreased to half of its original value:![V'=\frac{V}{2}](/tpl/images/0367/4748/f0ec7.png)
So, the new current will be
so, the current will drop to half of its original value.
Ответ: