what is the equation for working out amps
2007-09-25 10:21:07 · 7 answers · asked by PIRANHA 4 in Consumer Electronics ➔ Other - Electronics
V=IR
V is the voltage in volts
I is the current in amps
R is the resistance
P=IV
P is the power in watts
I is the currents in amps
V is the voltage in volts
2007-09-25 10:31:08 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Amps=Watts/Volts
2007-09-25 10:34:22 · answer #2 · answered by Pete D 1 · 1⤊ 0⤋
The KEY here is understanding what volts, amps, and watts are. Volts is a measure of voltage or EMF; Amps measures current; and Watts measure power.
Now there are many equations for calculating current in amps depending upon what other information you've got. But a standard and basic equation is this:
I = E / R, where:
1) I is tthe current measured in amps
2) E is the EMF measured in volts
3) R is the resistance measured in ohms
2007-09-25 23:52:15 · answer #3 · answered by msoexpert 6 · 0⤊ 0⤋
It's called "OHM'S LAW". Ohm's Law defines the relationships between (P) power, (E) voltage, (I) current, and (R) resistance. One ohm is the resistance value through which one volt will maintain a current of one ampere.
( I ) Current is what flows on a wire or conductor like water flowing down a river. Current flows from negative to positive on the surface of a conductor. Current is measured in (A) amperes or amps.
( E ) Voltage is the difference in electrical potential between two points in a circuit. It's the push or pressure behind current flow through a circuit, and is measured in (V) volts.
( R ) Resistance determines how much current will flow through a component. Resistors are used to control voltage and current levels. A very high resistance allows a small amount of current to flow. A very low resistance allows a large amount of current to flow. Resistance is measured in ohms.
( P ) Power is the amount of current times the voltage level at a given point measured in wattage or watts.
I = E / R
R =E / I
E = I x R
For example: 12 volts divided by 4 ohms = 3 amps.
2007-09-25 10:36:11 · answer #4 · answered by Char 1 3 · 2⤊ 1⤋
Power (watts) divided by voltage (volts) = current (amps)
(I = P/V )
2007-09-25 10:29:43 · answer #5 · answered by ? 3 · 1⤊ 0⤋
W=VxA therefore A=W/V.
ie in UK, 700 watts divide by 240 volts = 2.916 Amps.
There is an easy way to remember this - arrange in the following pattern.
...W...
-----------
V--x--A
Then simply place your finger over what you require. - for example if you need volts, cover V and you are left with W over A.
2007-09-27 09:34:59 · answer #6 · answered by Cliff E 5 · 0⤊ 0⤋
Well one of them is Ohm's Law where V = I R or
voltage = current x resistance, so
current (amps) = voltage /resistance
2007-09-25 10:31:53 · answer #7 · answered by drjaycat 5 · 1⤊ 0⤋