Enter any 3 values (current, voltage, time, or energy) into the calculator (selecting the correct units) to determine the missing value. The energy relationship used here assumes voltage and current are constant over the time interval (or that the values you enter represent appropriate average/real-power equivalents over that interval).
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Energy from Current Formula
The following equation is used to calculate the electrical energy transferred when current and voltage are constant over the time interval:
E = I \times V \times t
- Where E is the electrical energy transferred (joules, J)
- I is the current (amps)
- V is the voltage (volts)
- t is the time interval (seconds)
To calculate the energy, multiply the current by the voltage and the time interval (this is equivalent to energy = power × time with power = V × I when voltage and current are constant).
| Current (A) | Voltage (V) | Time (s) | Energy (J) | Energy (Wh) | Energy (kWh) |
|---|---|---|---|---|---|
| 0.5 | 5 | 60 | 150 | 0.042 | 0.000042 |
| 1 | 5 | 60 | 300 | 0.083 | 0.000083 |
| 2 | 5 | 60 | 600 | 0.167 | 0.000167 |
| 1 | 5 | 3600 | 18000 | 5.000 | 0.005000 |
| 2 | 5 | 3600 | 36000 | 10.000 | 0.010000 |
| 1 | 12 | 60 | 720 | 0.200 | 0.000200 |
| 2 | 12 | 60 | 1440 | 0.400 | 0.000400 |
| 5 | 12 | 60 | 3600 | 1.000 | 0.001000 |
| 1 | 12 | 3600 | 43200 | 12.000 | 0.012000 |
| 5 | 12 | 3600 | 216000 | 60.000 | 0.060000 |
| 1 | 24 | 60 | 1440 | 0.400 | 0.000400 |
| 2 | 24 | 60 | 2880 | 0.800 | 0.000800 |
| 5 | 24 | 60 | 7200 | 2.000 | 0.002000 |
| 1 | 24 | 3600 | 86400 | 24.000 | 0.024000 |
| 5 | 24 | 3600 | 432000 | 120.000 | 0.120000 |
| 1 | 120 | 60 | 7200 | 2.000 | 0.002000 |
| 5 | 120 | 60 | 36000 | 10.000 | 0.010000 |
| 10 | 120 | 3600 | 4320000 | 1200.000 | 1.200000 |
| 15 | 120 | 3600 | 6480000 | 1800.000 | 1.800000 |
| 10 | 230 | 3600 | 8280000 | 2300.000 | 2.300000 |
| Formula: E (J) = I (A) × V (V) × t (s). Conversions: 1 Wh = 3600 J; 1 kWh = 3,600,000 J. | |||||
How to Calculate Energy from Current?
The following example problems outline the steps and information needed to calculate the Energy from the Current.
Example Problem #1
- First, determine the current (amps). In this example, the current (amps) is determined to be 4.
- Next, determine the voltage (volts). For this problem, the voltage (volts) is measured to be 3.
- Next, determine the time (seconds). In this case, the time (seconds) is found to be 10.
- Finally, calculate the Energy from Current using the formula above:
E = I × V × t
Inserting the values from above and solving the equation yields:
E = 4*3*10 = 120 (Joules)
FAQ
What is the unit of measurement for energy in the context of calculating energy from current?
The SI unit of energy is the joule (J). In electrical applications, energy is also commonly expressed in watt-hours (Wh) or kilowatt-hours (kWh), where 1 Wh = 3600 J.
Can the formula for calculating energy from current be used for any type of electrical circuit?
Not always. The shortcut E = I × V × t is valid when the voltage and current are constant over the time interval (or when you use appropriate time-averaged values so that V × I represents the real power). In general, electrical energy is found from the time integral of instantaneous power: E = ∫ v(t) i(t) dt. For steady sinusoidal AC, a common real-power form is E = Vrms Irms cos(φ) × t (where cos(φ) is the power factor).
How can I measure the current, voltage, and time needed to calculate energy from current?
To measure the current (I) and voltage (V) in a circuit, you can use a multimeter. The current is measured by connecting the multimeter in series with the circuit, and the voltage is measured by connecting it in parallel. Time (t) can be measured using any standard timing device, such as a stopwatch or a timer, depending on the duration of the current flow you are interested in observing.
