Calculate voltage/current/resistance/power.
Enter 2 values to get the other values and press the Calculate button:
Voltage (V)
Current (I)
Resistance (R)
Power (P)
Calculation
- Ohm's law with examples
- Voltage divider
- Watts to amps
Ohm's law calculation formula
The current I in amps (A) is equal to the voltage V in volts (V) divided by the resistance R in ohms (Ω):
I = V / R
Example
I = 20V / 10Ω = 2A
The power P in watts (W) is equal to the voltage V in volts (V) times the current I in amps (A):
P = V × I
Example
P = 20V × 2A = 40W
AC Ohm's law calculator
Enter 2 values of magnitude+phase angle to get the other values and press the Calculate button:
Impedance (Z): | ||||||
∠ | ° | = | ||||
Current (I): | ||||||
∠ | ° | |||||
Voltage (V): | ||||||
∠ | ° | |||||
Power (S): | ||||||
∠ | ° | = | ||||
AC Ohm's law calculation formula
The voltage V in volts (V) is eqaul to the current I in amps (A) times the impedance Z in ohms (Ω):
V(V) = I(A) × Z(Ω) = (|I|×|Z|) ∠ (θI + θZ)
The complex power S in volt-amps (VA):
S(VA) = (|V|×|I|) ∠ (θV - θI)
Ohm's law ►
See also
- Ohm's law
- Voltage divider
- Watts to amps
- kW to amps
- Resistance
- Electric current
- Electric voltage
- Complex numbers calculator
Please provide any 2 values and click "Calculate" to get the other values in the ohm's law equations V = I × R and P = V × I.
Ohm's Law
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 from these materials remain constant. Ohm's Law is 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.
Where:
V is voltage in Volts
R is resistance in Ohms
I is current in Amperes
Electrical Power
Power is the rate at which electrical energy is transferred by an electric circuit per unit time typically expressed in the SI (International System of Units) unit of Watts. Power is typically produced by electric generators and supplied to businesses and homes through the electric power industry, but can also be supplied by electric batteries or other sources.
In resistive circuits, Joule's Law can be combined with Ohm's Law to produce alternative expressions for the amount of power dissipated, as shown below.
Where:
P is power in Watts
Ohm's Law Formula Wheel
Below is a formula wheel for Ohm's Law relationships between P, I, V, and R. This is essentially what the calculator does, and is just a representation of the algebraic manipulation of the equations above. To use the wheel, choose the variable to solve for in the middle of the wheel, then use the relationship for the two known variables within the cross section of the circle.
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Terms in this set (20)
How is current measured within a in line type meter?
By placing an ammeter in series with the circuit
A circuit has a source voltage of 50v and a current of 10a. what is the power in watts?
500
voltage is defined as the_______.
force that causes electrons to flow
if a circuit has 12 amps of current and the resistance is 20 ohms, the applied voltage is_____.
240 volts
if two 10-ohm resistors are connected in series, what is the total resistance of these resistors?
20
make sure the voltage is turned off before touching any terminals by using a_____.
voltage tester
how many amps are there in the current of a circuit if the voltage source is 140V and the resistance is 2ohms?
70
material with electrical characteristics that fall between those of insulators and conductors are considered_____.
semiconductors
what is the applied voltage if the current in a circuit is 60 amps and the resistance is 10 ohms?
600 Volts
copper is considered a____.
Conductor
which of the following is used to step voltage down to lower levels before it reaches a home or office?
A Transformer
what is the applied voltage of a circuit that has 10 amps of current and 12 ohms of resistance?
120 volts
A 5-ohm and a 20-ohm resistor are connected in parallel. What is the total resistance of these two resistors?
4 ohms
which of the following terms is defined as the driving force that makes current flow in a circuit?
voltage
if the resistance of a circuit is 25 ohms and the current is 10 amps, the power in watts is____.
2,500
ohms law states that the resistance of a circuit is equal to the_____.
voltage divided by the current
if a circuit has 48 amps of current and an applied voltage of 240 volts, the resistance is______.
5 ohms
you would measure resistance with an____.
ohmmeter
which of the following substances is considered a good semi conductor?
Silicon
in a parallel circuit, the voltage drop is________.
is the same across all loads
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