Question

A 120 resistor a 60 ohm resistor and a 40 ohm resistor are connected in parallel to a 120 volt power source. what is the current running through the entire circuit?

Answer 1

6 A

Step-by-step explanation:

First of all, we need to calculate the equivalent resistance of the circuit. The three resistors are connected in parallel, so their equivalent resistance is given by:

`(1)/(R_T)=(1)/(R_1)+(1)/(R_2)+(1)/(R_3)=(1)/(120 \Omega)+(1)/(60 \Omega)+(1)/(40 \Omega)=(3+2+1)/(120 \Omega)=(6)/(120 \Omega)\\R_T = (120)/(6) \Omega`

And now we can use Ohm's law to find the current in the circuit:

`V=R_T II=(V)/(R_T)=(120 V)/((120)/(6)\Omega)=6 A`