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DC Motor Power Formula:
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DC motor power represents the electrical power input to a DC motor, calculated as the product of voltage and current. It indicates the rate at which electrical energy is converted into mechanical energy.
The calculator uses the DC power formula:
Where:
Explanation: This fundamental electrical formula calculates the electrical power input to a DC motor based on the voltage applied and the current drawn.
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 calculation.
Q1: What is the difference between input power and output power?
A: Input power is the electrical power supplied to the motor (P = V × I), while output power is the mechanical power delivered by the motor shaft, which is less due to efficiency losses.
Q2: How does motor efficiency affect power calculation?
A: Efficiency = (Output Power / Input Power) × 100%. The calculated power here is input power; actual mechanical output power will be lower due to efficiency losses.
Q3: What are typical voltage and current ranges for DC motors?
A: DC motors typically operate from 6V to 48V, with current ranging from milliamps for small motors to tens of amps for larger industrial motors.
Q4: Why is power calculation important for motor selection?
A: Proper power calculation ensures the motor can handle the required load and helps select appropriate power supplies and protection devices.
Q5: Can this formula be used for AC motors?
A: No, AC motor power calculation requires considering power factor (P = V × I × PF). This formula is specifically for DC electrical input.