Terminal Voltage Calculator
Calculate the terminal voltage of a battery or generator using EMF, internal resistance, and load current with this simple tool and formula.
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internal resistance voltage calculator
The real voltage on the terminals of a battery or generator is referred to as terminal voltage. Formula: Vt = E - I × r.
Formula & Table Summary:
| Formula | Description |
|---|---|
| Vt = E - I × r | Terminal voltage formula |
| Vt = E | No load condition |
| Vt < E | Under load condition |
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emf and terminal voltage formula
Terminal Voltage Calculator assists in determining the actual output voltage of a battery or generator with reference to EMF, load-current, and internal resistance.
generator terminal voltage
| EMF (E) (V) | Internal Resistance (Ω) | Current (A) | Terminal Voltage (V) |
|---|---|---|---|
| 12 | 0.2 | 5 | 11 |
| 24 | 0.1 | 10 | 23 |
| 48 | 0.5 | 20 | 38 |
| 6 | 0.05 | 2 | 5.9 |
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Frequently Asked Questions - Terminal Voltage Calculator:
Terminal voltage is the actual voltage available at the terminals of a source when current flows through it.
Use Vt = E - I × r, where E is EMF, I is current, and r is internal resistance.
EMF is the ideal source voltage, while terminal voltage is the practical output under load.
When no current flows (open circuit), terminal voltage equals EMF.
Because of the voltage drop across the source's internal resistance.
Yes, in charging conditions, terminal voltage can exceed EMF.
Voltage is measured in volts (V), current in amperes (A), resistance in ohms (Ω).
Yes, it affects battery efficiency and output voltage under load.
Yes, it works for both batteries and generators.
Because internal resistance consumes part of the EMF, reducing the output.
