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DC Motor Power Formula:
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DC motor electrical power represents the rate at which electrical energy is converted into mechanical energy. It is calculated using the fundamental electrical power formula P = V × I, where P is power in watts, V is voltage in volts, and I is current in amperes.
The calculator uses the DC motor power equation:
Where:
Explanation: This formula calculates the input electrical power to the DC motor, which represents the electrical energy consumed per unit time.
Details: Accurate power calculation is essential for motor selection, circuit design, efficiency analysis, and ensuring proper power supply capacity for DC motor applications.
Tips: Enter voltage in volts and current in amperes. Both values must be positive numbers greater than zero for accurate power calculation.
Q1: What is the difference between electrical power and mechanical power in DC motors?
A: Electrical power (P = V × I) is the input power, while mechanical power is the output power. The difference represents losses due to efficiency factors.
Q2: How does motor efficiency affect power calculations?
A: Efficiency (η) relates electrical input power to mechanical output power: Mechanical Power = Electrical Power × η. Typical DC motor efficiencies range from 70-90%.
Q3: Can this formula be used for AC motors?
A: No, AC motor power calculation requires consideration of power factor: P = V × I × PF for single-phase, and P = √3 × V × I × PF for three-phase systems.
Q4: What are typical voltage and current ranges for DC motors?
A: DC motors commonly operate at 6V, 12V, 24V, or 48V with currents ranging from milliamps for small motors to hundreds of amps for large industrial motors.
Q5: Why is power calculation important for motor selection?
A: Proper power calculation ensures the motor can handle the required load, prevents overheating, and helps select appropriate power supplies and protection devices.