You cannot turn kJ into kW with a single number. Energy needs a time, and the sum is power equals energy divided by time. Quick answer: divide the kilojoules by the seconds. For example, 7,200 kJ in 3,600 s is 2 kW, 5,000 kJ in 100 s is 50 kW and 1,000 kJ in 60…
A 230 V supply that pushes 10 amps through a motor delivers 2,300 watts of electrical power, which is about 3.08 horsepower. Quick answer: Multiply the volts by the amps, then divide by 745.7. For example, 230 V at 10 A is 3.084 hp, 120 V at 15 A is 2.414 hp and 400 V…
A coil with 100 ohms of reactance at 50 hertz has an inductance of about 0.318 henry. Quick answer: Divide the reactance by 2 times pi times the frequency. For example, 100 ohms at 50 Hz is 0.3183 H, 377 ohms at 60 Hz is 1 H and 1,000 ohms at 1,000 Hz is 0.1592…
An electric car has a 70 kWh battery, but how far it goes depends on a second number that most buyers never check: how many miles each kilowatt hour buys. Quick answer: multiply the kWh by your efficiency in miles per kWh. At a typical 3.5 mi/kWh, 70 kWh gives about 245 miles, 40 kWh…
File sizes in bytes have many digits. Divide by 1,000,000 to see the MB. Quick answer: multiply the size in B by 0.000001. For example, 1,000,000 B is 1 MB, 2,500,000 B is 2.5 MB and 5,000,000 B is 5 MB. The B to MB formula One MB is 1,000,000 bytes in the SI (Wikipedia:…
A specific volume of 0.001 m3/kg means a density of 1,000 kg/m3, which is water. Quick answer: Divide 1 by the specific volume. For example, 0.001 m3/kg is 1,000 kg/m3, 0.002 m3/kg is 500 kg/m3 and 0.5 m3/kg is 2 kg/m3. The specific volume to density formula Density equals 1 divided by the specific volume….
A level of 20 dBV is 10 volts, and the pro audio level of +4 dBu is about 1.23 volts. Quick answer: Divide the dB by 20, raise 10 to that power, then multiply by the reference voltage. For example, 20 dBV is 10 V, 4 dBu is 1.228 V and 40 dBmV is 0.1…
4 quarters make exactly 1 dollar. Quick answer: Multiply the number of quarters by 0.25, or divide by 4. For example, 4 quarters is 1 dollars, 10 quarters is 2.5 dollars and 40 quarters is 10 dollars. The quarters to dollars formula Dollars equal the number of quarters times 0.25. A quarter is worth 25…
100 g of sugar is 24 teaspoons, but 100 g of table salt is only 16.4 teaspoons. Quick answer: Multiply the grams by 48 and divide by the grams per cup. For example, 100 g of granulated sugar is 24 tsp, 100 g of water is 20.288 tsp and 100 g of brown sugar (packed)…
Engines are rated in horsepower, while heat is rated in Btu per hour. Divide Btu/h by 2,544.43 to switch. Quick answer: multiply the result in Btu/h by 0.00039301. For example, 10,000 Btu/h is 3.93 hp, 2,544.4336 Btu/h is 1 hp and 5,000 Btu/h is 1.965 hp. The Btu/h to hp formula One mechanical horsepower is…