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Electrical converters translate between voltage, current, resistance, power, and energy units (V, A, Ω, W, kW, kWh, etc.).
Formel
Ohm\'s Law: V = I × R
- V
- I²R = V²/R — I²R = V²/R
- I
- I²R = V²/R — I²R = V²/R
- R
- R value — Variable used in the calculation
Trin-for-trin guide
- 1Ohm's Law: V = I × R
- 2Power: P = V × I = I²R = V²/R
- 3Energy: E = P × t (watts × hours = watt-hours)
Løste eksempler
Input
120V, 10A circuit
Resultat
Resistance 12Ω, power 1200W, daily energy (24hr) 28.8 kWh
Typical household
Almindelige fejl at undgå
- ✕Adding watts from different circuits (totals correctly)
- ✕Confusing kW with kWh (power vs. energy)
Ofte stillede spørgsmål
Why distinguish watts from watt-hours?
Watts = instantaneous power; watt-hours = total energy used. Bills charge for energy, not power.
How do you reduce electrical cost?
Reduce watts (efficient appliances) or reduce hours (use less). Biggest impacts: heating, cooling, water heating.
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