2006-12-17 07:50:37 · 10 answers · asked by JR 1 in Science & Mathematics ➔ Physics
If you mean electrical resistance, V=IR, so you'd need to know the voltage and current.
2006-12-17 07:51:52 · answer #1 · answered by Ooze90 3 · 1⤊ 0⤋
there are several ways u can calculate it
1 using power(P) = I(sq) X R R = P/(Isq)
where I = current and R = resisatnce
also u can use
P = I x V where V = voltage
substitute P = I(sq) R
u get I x R = V
thus Resistance = Voltage/I(current)
so u need 2 know either the power and the current
or the Voltage and the current
i think.
2006-12-17 16:02:09 · answer #2 · answered by Anonymous · 0⤊ 0⤋
These work for DC currents:
voltage = resistance (R in ohms) X current (I in amperes). If you know Power (P in wattage) , then Power = Current X Voltage.
So, for example, a 10 watt load needs how much current if 12 volts is applied?
I = P/ V
I = 10 watts divided by 12 volts = 0.83amps.
That help?
2006-12-17 16:01:23 · answer #3 · answered by waynebudd 6 · 0⤊ 0⤋
Resistance is voltage divided by current. This is Ohm's law
2006-12-17 15:57:31 · answer #4 · answered by Renaud 3 · 0⤊ 0⤋
V = I x R (voltage = current x resistence)
R = V / I (resistence = voltage divided by current)
2006-12-17 15:53:36 · answer #5 · answered by Sibbs . 4 · 0⤊ 0⤋
You need to know the voltage and the current and divide V by I.
That will give you a value in OHMS. Kirchoffs law.
2006-12-17 15:55:18 · answer #6 · answered by grassland44 2 · 0⤊ 0⤋
divide ur voltage by ur current, well i used to when i was at college many moons ago, never used it since
2006-12-17 15:55:32 · answer #7 · answered by Michael F 5 · 0⤊ 0⤋
voltage and current: V = IR
2006-12-20 07:44:26 · answer #8 · answered by helen g 3 · 0⤊ 0⤋
You don't need to. RESISTANCE IS FUTILE. Hee hee hee...
2006-12-17 15:58:46 · answer #9 · answered by Anonymous · 0⤊ 0⤋
How to use an ohmmeter.
2006-12-17 15:56:16 · answer #10 · answered by Jonah 2 · 0⤊ 0⤋