Question

If a current of 2 amps is moving through a circuit connected to a 9 V battery, what is the resistance of the circuit?

?

4.5 ohms


18 ohms


0.2 ohms


7 ohms



I think that the answer might be D because 9-2 is 7? But I really don't know, if someone could explain how they got their answer that'd be great. Thanks millions.

Answer 1

I stands for current in amps
V stands for voltage in volts
R stands for resistance in ohms

Their mathematical relationship is thus;
I=V/R

That is 2=9/R
Cross multiplying we have;

2R=9

Divide both side by 2

We have;
R=9/2
R=4.5 ohms