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Voltage Calculator
A
ฮฉ
V
ฮฉ
ฮฉ
Voltage (V = I ร R)
50 V
Power
25 W
Current
0.5 A
Ratio
50%
Total R
20 kฮฉ
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How to Use the Voltage Calculator
- Choose Ohm's Law or Voltage Divider mode
- Enter the required values
- View calculated voltage and related values
Common Applications
- Voltage Drop - Calculate losses in wires and components
- Voltage Dividers - Create reference voltages for sensors
- Power Supplies - Design voltage regulation circuits
- LED Circuits - Determine voltage across components
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Frequently Asked Questions
How do I calculate voltage drop?
Voltage drop = Current ร Resistance (V = I ร R). It's the voltage lost across a component or wire.
What is a voltage divider?
A voltage divider uses two resistors to reduce voltage. Vout = Vin ร (R2 / (R1 + R2)).
Why is voltage drop important?
Excessive voltage drop wastes energy and can cause equipment malfunction. Keep it under 3-5% for long wire runs.
How do I calculate wire voltage drop?
Use V = 2 ร I ร R ร L, where L is wire length. The factor of 2 accounts for round-trip current flow.