Calculate voltage/current/resistance/power. Show
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 calculation formulaThe 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 calculatorEnter 2 values of magnitude+phase angle to get the other values and press the Calculate button:
AC Ohm's law calculation formulaThe 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
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 LawOhm'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 Electrical PowerPower 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 WheelBelow 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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How is current measured with in line type meter?It is measured in the unit of the Ampere, simply called “Amp,” (A). The most common way to measure current in a circuit is to break the circuit open and insert an “ammeter” in series (in-line) with the circuit so that all electrons flowing through the circuit also have to go through the meter.
How do I calculate resistance?R = V ÷ I Question
What is the resistance of the lamp? To calculate the resistance of an electrical component, an ammeter is used to measure the current and a voltmeter to measure the potential difference. The resistance can then be calculated using Ohm's Law.
What is used to step the voltage down before it reaches a home or office?Power transformers are used to step the voltage down to an acceptable level to bring into your neighborhoods. We're not ready to get the power to your house just yet; the voltage coming from the power transformer, at 25,000 or 13,200 volts, is still too high to go directly into your home.
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If the resistance of a circuit is 25 ohms and the current is 10 amps, the power in watts is?
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