Answered

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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

Sagot :

Answer: 6 A

Step-by-step explanation:

Given

Current varies directly with Voltage

i.e.

[tex]I\ \propto V\ or\\V\ \propto\ I\\V=IR[/tex]

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

[tex]\Rightarrow 12=4R\\\Rightarrow R=3\ \Omega[/tex]

When V=18 V

[tex]\Rightarrow 18=I\times 3\\\Rightarrow I=6\ A[/tex]

Current is  6 Ampere

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