🎓 Physics • Energy
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Power Calculator (P = W / t)
Computes mechanical and energetic power P = W / t with conversions to Watts, kW, and Horsepower.
Alternating Current Analysis
AC Power Calculator
Real (W), Apparent (VA), and Reactive (VAR) power across 1-Phase and 3-Phase networks.
Real Power (P)
17.67 kW
17,667 Watts (Useful Work)Apparent Power (S)
20.78 kVA
20,785 VA (Total Vector)Reactive Power (Q)
10.95 kVAR
10,949 VAR (Magnetizing)Power Triangle & Phase Angle
θ = 31.8°In an AC system, real power $P$ does the productive mechanical and thermal work, while reactive power $Q$ energizes motor electromagnetic windings without performing net work.
Phase Current:
25 A
Power Factor:
85%
Phase Multiplier:
√3 (1.732)
Harmonic Vector:
S² = P² + Q²
What is Power in Physics?
Power is the rate at which work is performed or energy is converted per unit of time.
Formula & Step-by-Step Calculation
P = W / t = F × v
1 Watt (W) = 1 Joule per second.
Worked Step-by-Step Examples
Example 1
15,000 Joules of work done in 5 seconds
Solution: 3,000 Watts (3 kW or 4.02 hp)
• 15,000 / 5 = 3,000 W
Common Real-World & Academic Use Cases
- ✓ Engine horsepower ratings
- ✓ Electric motor output sizing
- ✓ Athlete power output benchmarks
How to Use the Power Calculator (P = W / t)
1
Enter Work & Time
Input Joules and seconds.
2
Read Power
Inspect Watts, kW, and horsepower.
Frequently Asked Questions
Q: How many Watts in one horsepower?
1 mechanical horsepower (hp) ≈ 745.7 Watts.