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# Help with Resistance formula.

How to find the voltage after adding a resistor with the resistance formula? For example I have a circuit that uses 0.975A and I add a 1000ohm resistor to it, if its powered by 220v main then according to V=IR what should be the voltage drop due to the resistor?

## Comments

Best Answer 7 years ago

V=IR

It would depend series or parallel.

Parallel that resistor and that voltage it would be 0.22 A and 220 volt drop across the resistor.

in series it would be along the lines described by icing so it would be IR=V or

0.179 x 1000 = 179 volts drop across the resistor.

and

0.179 x 226 = 41 volts drop across the circuit.

These numbers are rounded.

Joe

7 years ago

R

_{AC}= V/I = 220/o.975 = 226 Ohms ImpedanceSounds like a Power Toaster

Now you add 1000 more ohms for a total of 1226 ohms

New AC Current = V/R = 220 / 1226 = o.179A

7 years ago

You need to know 2 of the 3 variables - Voltage - Resistance - Current. Then you can calculate the third.

Volts= Current x Resistance

V=Volts

I=Current (amps)

R = resistance (ohms)

V=I x R

so

I=V/R

or

R=V/I

7 years ago

What's the circuit ?