If voltage in a circuit is constant, the current can be cut to half of its original value by changing the resistance to
its original value

one-fourth

one-half

two times

four times

Two times

Explanation:

Let us remember the law of ohm, which tells us that the voltage of a circuit is equal to the product of the current by the resistance. Therefore

If we use numeric values we can check the answer given, if the voltage is equal to V=220 [V] and the original resistance is 10 [ohm], we find that the current is equal to:

Now if we take the current as I = 11 [amp] half of the original, then the resistance will be:

Now the resistance has a value of 20[ohm] this is two times the original value.

the answer would be a

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