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The formula for voltage (in volts) is given by V = IR, where I is the current in amperes, and R is the resistance in ohms. If a light bulb uses 0.4 amperes of current at a voltage of 1.8 volts, the formula to find R is , and the resistance of the bulb is ohms.

Verified Answer :

Nekoneko

So they give us this
V=IR
V= 1.8
I=0.4
R=?

So we insert the thing that we know.
1.8=0.4*R

We need to leave our unknown value alone. So if our value of 0.4 is multiplying the unknown value it passes to the other side dividing.

So we have this.
\(\frac{1.8}{0.4} =R\)

Lastly we solve.
R=4.5ohms

Setor9

The formula to find R is V=IR
V/I=R
So the resistance will be the Voltage divided by the Current