| Internal Resistance of Manganese Dry Cells (1.5V) | |
|---|---|
| D cell | 0.15 - 0.20 (Ω) |
| C cell | 0.25 - 0.35 (Ω) |
| AA cell | 0.40 - 0.50 (Ω) |
Type of Power Supply
Unlike the constant-voltage power supply, the power supply with resistance will have a voltage drop due to its internal resistance, causing the stall current and, therefore, the stall torque to drop with the speed line bottomed to the left.
- A motor can be expressed as a generator that produces voltages proportional to its rotational speeds and the in-series resistance across motor terminals.