Question

The electric current is I, is amperes, in a circuit varies directly as the voltage V. When 12 volts are applied the current is 4 amperes. What is the current when 18 volts are applied

Answer 1

Answer: 6 A

Explanation:

Given

Current varies directly with Voltage

i.e.

`I\ \propto V\ or\\V\ \propto\ I\\V=IR`

when V=12 V, I=4 A i.e.

`\Rightarrow 12=4R\\\Rightarrow R=3\ \Omega`

When V=18 V

`\Rightarrow 18=I* 3\\\Rightarrow I=6\ A`

Current is 6 Ampere