Question

1.

Determine the voltage needed to cause a current of 4 amps in a circuit having
a resistance of 30 ohms.

Answer 1

The voltage needed = 120 V

Further explanation

Electric current (symbolized by the letter "i) is the amount of charge flowing in the conductor of each unit of time

Can be formulated:

`\large{\boxed{\bold{I=(Q)/(t)}}`

Q = charge (Coulomb)

t = time (seconds)

The international standard unit of electric current is Coulomb/second or Ampere (A).

Electric current is also a ratio between the voltage and the amount of resistance at the conductor.

Can be formulated

`\large{\boxed{\bold{I=(V)/(R)}}`

V = Voltage (volts)

R = resistance (ohms)

I=current=4 A

R=resistance=30 Ω

The voltage needed :

`\tt V=I* R\\\\V=4* 30\\\\V=\boxed{\bold{120~V}}}`