How to convert electric current in amps (A) to resistance in ohms (Ω).
You can calculate ohms from amps and volts or watts, but you can't convert amps to ohms since ohm and amp units represent different quantities.
The resistance R in ohms (Ω) is equal to the voltage V in volts (V), divided by the current I in amps (A):
R(Ω) = V(V) / I(A)
So
ohm = volt / amp
or
Ω = V / A
What is the resistance of an electrical circuit that has voltage supply of 12 volts and current flow of 0.5 amp?
The resistance R is equal to 12 volts divided by 0.5 amp:
R = 12V / 0.5A = 24Ω
What is the resistance of an electrical circuit that has voltage supply of 15 volts and current flow of 0.5 amp?
The resistance R is equal to 15 volts divided by 0.5 amp:
R = 15V / 0.5A = 30Ω
What is the resistance of an electrical circuit that has voltage supply of 120 volts and current flow of 0.5 amp?
The resistance R is equal to 120 volts divided by 0.5 amp:
R = 120V / 0.5A = 240Ω
The resistance R in ohms (Ω) is equal to the power P in watts (W), divided by the square value of the current I in amps (A):
R(Ω) = P(W) / I(A)2
So
ohm = watt / amp2
or
Ω = W / A2
What is the resistance of an electrical circuit that has power consumption of 50W and current flow of 0.5 amp?
The resistance R is equal to 50 watts divided by the squared value of 0.5 amp:
R = 50W / 0.5A2 = 200Ω
What is the resistance of an electrical circuit that has power consumption of 80W and current flow of 0.5 amp?
The resistance R is equal to 80 watts divided by the squared value of 0.5 amp:
R = 80W / 0.5A2 = 320Ω
What is the resistance of an electrical circuit that has power consumption of 90W and current flow of 0.5 amp?
The resistance R is equal to 90 watts divided by the squared value of 0.5 amp:
R = 90W / 0.5A2 = 360Ω
Ohm | Volt/ampere [V/A] |
---|---|
0.01 ohm | 0.01 V/A |
0.1 ohm | 0.1 V/A |
1 ohm | 1 V/A |
2 ohm | 2 V/A |
3 ohm | 3 V/A |
5 ohm | 5 V/A |
10 ohm | 10 V/A |
20 ohm | 20 V/A |
50 ohm | 50 V/A |
100 ohm | 100 V/A |
1000 ohm | 1000 V/A |
1 ohm = 1 V/A
1 V/A = 1 ohm
Example: convert 15 ohm to V/A:
15 ohm = 15 × 1 V/A = 15 V/A
Ohm's law states that the current through a conductor between two points is directly proportional to the voltage. This is true for many materials over a wide range of voltages and currents, and the resistance and conductance of electronic components made of these materials remain constant.
Ohm's law holds true for circuits that contain only resistive elements (no capacitors or inductors), regardless of whether the driving voltage or current is constant (DC) or time-varying (AC). It can be expressed using a number of equations, usually all three together, as shown below.
V = I × R | ||||
R = |
| |||
I = |
|
Where:
Volt/ampere [V/A] | Ohm |
---|---|
0.01 V/A | 0.01 ohm |
0.1 V/A | 0.1 ohm |
1 V/A | 1 ohm |
2 V/A | 2 ohm |
3 V/A | 3 ohm |
5 V/A | 5 ohm |
10 V/A | 10 ohm |
20 V/A | 20 ohm |
50 V/A | 50 ohm |
100 V/A | 100 ohm |
1000 V/A | 1000 ohm |
1 V/A = 1 ohm
1 ohm = 1 V/A
Example: convert 15 V/A to ohm:
15 V/A = 15 × 1 ohm = 15 ohm
Current (I) is the rate of flow and is measured in amps (A). Ohm (R) is a measure of resistance and is analogous to the size of a water pipe. Current is proportional to the diameter of the pipe or the amount of water flowing at that pressure.
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