BILL PITC WEB
⚡ Electrical Calculator Suite
Complete electrical calculations for watts, volts, amps, ohms and more
Ohm's Law Calculator
Calculate Voltage, Current, Resistance, and Power
Definition
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points. It's the fundamental relationship in electrical circuits.
Example
Given: Voltage = 12V, Current = 2A
Calculate: Resistance = V/I = 12/2 = 6Ω
Power: P = V×I = 12×2 = 24W
Watts ↔ Amps Calculator
Convert between electrical power and current
Definition
This calculator converts between watts (power) and amps (current). Power is the rate of energy consumption, while current is the flow of electric charge. The relationship depends on voltage and circuit type.
Example
Given: Power = 1000W, Voltage = 120V (AC Single Phase), PF = 0.8
Calculate: Current = P/(V×PF) = 1000/(120×0.8) = 10.42A
Watts ↔ Joules Calculator
Convert between power and energy
Definition
Watts measure power (rate of energy transfer), while joules measure energy. One watt equals one joule per second. This calculator helps convert between power consumption and total energy used over time.
Example
Given: Power = 100W, Time = 60 seconds
Calculate: Energy = P×t = 100×60 = 6,000 Joules
Watts ↔ kWh Calculator
Convert power to kilowatt-hours for energy billing
Definition
Kilowatt-hours (kWh) represent energy consumption over time and are commonly used for electricity billing. One kWh equals 1000 watts used for one hour.
Example
Given: Power = 1500W (heater), Time = 8 hours
Calculate: Energy = (1500×8)/1000 = 12 kWh
Watts ↔ Volts Calculator
Calculate voltage from power and current
Definition
This calculator determines voltage when power and current are known. Voltage represents electrical potential difference, measured in volts. The calculation varies for DC and AC circuits.
Example
Given: Power = 240W, Current = 2A (DC circuit)
Calculate: Voltage = P/I = 240/2 = 120V
Watts ↔ VA Calculator
Convert between real power and apparent power
Definition
Watts measure real power (actual work done), while VA (Volt-Amperes) measure apparent power (total power supplied). The relationship between them involves the power factor in AC circuits.
Example
Given: Real Power = 800W, Power Factor = 0.8
Calculate: Apparent Power = 800/0.8 = 1000 VA
Watts ↔ kVA Calculator
Convert between real power and apparent power in kilovolt-amperes
Definition
kVA (kilovolt-amperes) represents apparent power in thousands of volt-amperes. It's commonly used for rating transformers and generators. Real power (watts) is the actual usable power.
Example
Given: Real Power = 15,000W, Power Factor = 0.85
Calculate: Apparent Power = 15,000/(1000×0.85) = 17.65 kVA
FAQS
How do you calculate volts, amps, and watts with a calculator?
Use Watt’s Law formula: Watts = Volts × Amps, or rearrange it as Volts = Watts ÷ Amps, and Amps = Watts ÷ Volts. Most electrical calculators use these basic formulas to convert between power, voltage, and current measurements instantly.
How do I convert 1000 watts to volts, amps, joules, kWh, VA, kVA, and ohms?
A: 1000 watts converts differently based on circuit specifications: at 120V = 8.33 amps, at 240V = 4.17 amps, equals 1 kW, converts to 1000 VA (for DC), and requires voltage/current values to calculate ohms using Ohm’s law. For energy conversion, 1000 watts running for 1 hour equals 1 kWh.
How many watts does 1 amp equal?
1 amp equals different wattage depending on voltage: at 120V = 120 watts, at 240V = 240 watts, at 12V = 12 watts. The formula is Watts = Amps × Volts, so amperage alone cannot determine wattage without knowing the voltage.
How many watts does 1 volt equal?
A: 1 volt alone doesn’t equal any specific wattage because watts require both voltage and current (amps). The power formula is Watts = Volts × Amps, so 1 volt × 1 amp = 1 watt, but voltage by itself doesn’t determine power consumption.
How do I calculate electrical power consumption and energy costs?
A: Multiply device wattage by hours used, then divide by 1000 for kWh: (Watts × Hours) ÷ 1000 = kWh. Multiply kWh by your electricity rate to find costs: a 1000W device running 5 hours = 5 kWh, costing about $0.65 at $0.13/kWh rates.
What safety considerations should I know when using electrical calculators?
A: Always verify calculations with qualified electricians for high-power installations, ensure circuit breakers are properly sized with 20% safety margin, and never exceed wire ampacity ratings. Electrical calculations help with planning, but professional installation and inspection ensure code compliance and safety.
Q: How do I use a watts to amps calculator?
A: Enter your wattage and voltage values into the calculator, then it automatically applies the formula Amps = Watts ÷ Volts. For example, 1200 watts ÷ 120 volts = 10 amps, helping you determine if your electrical circuit can handle the load safely.
How do I use a watts to ohms calculator?
A: First calculate amps using Watts ÷ Volts = Amps, then use Ohm’s Law: Ohms = Volts ÷ Amps, or use the direct formula Ohms = Volts² ÷ Watts. For resistance calculations, you need either voltage/current values or power/voltage combinations to determine ohm readings.
How do I convert watts to amps at 240V?
A: Divide watts by 240 volts using the formula: Amps = Watts ÷ 240V. Examples: 1000W ÷ 240V = 4.17A, 2400W ÷ 240V = 10A, 4800W ÷ 240V = 20A. This conversion helps determine proper circuit breaker sizing for 240V appliances and equipment.
How do I convert watts to amps at 12V?
A: Use the formula Amps = Watts ÷ 12V for DC circuits and automotive applications. Examples: 120W ÷ 12V = 10A, 240W ÷ 12V = 20A, 600W ÷ 12V = 50A. This calculation is essential for sizing DC power supplies, battery systems, and automotive electrical components.
What is the difference between watts, VA, and kVA in electrical calculations?
A: Watts measure real power consumed by devices, VA (volt-amps) represents apparent power including reactive components, and kVA equals 1000 VA for larger systems. In DC circuits, watts equal VA, but AC circuits may have different values due to power factor differences.
How accurate are online electrical calculators for real-world applications?
A: Online calculators provide accurate results for basic DC calculations and resistive AC loads using standard formulas. However, complex AC circuits with motors, transformers, or power electronics require professional analysis considering power factor, harmonics, and other variables that simple calculators cannot account for.