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EMF & internal resistance
V = E − Ir
Where: E = energy (J) / electric field (N/C), I = moment of inertia (kg·m²) / current (A), V = volume (m³) / potential difference (V), r = radius / distance (m)
Solved example
Given: E = 7, I = 5, r = 10
Find: V (volume (m³) / potential difference (V))
- Formula: V = E - I·r
- Substitute the values: V = -10·5 + 7
- Result: V = -43
Answer: V = -43
Calculator
How to calculate EMF & internal resistance
- Write down the formula: V = E − Ir.
- Note the known values (E, I, r).
- Substitute them and simplify to find V.
- Use the calculator above to solve for any letter.
Frequently asked questions
What is the formula for EMF & internal resistance?
The formula is V = E − Ir, where E = energy (J) / electric field (N/C), I = moment of inertia (kg·m²) / current (A), V = volume (m³) / potential difference (V), r = radius / distance (m).
What is EMF & internal resistance when E = 7, I = 5, r = 10?
V = -43. Substitute the values into V = E − Ir and simplify.