FORMULA SHELF
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The arithmetic behind the work: what to measure, what to type in, and what the answer comes out as. Every formula says what the symbols mean and gives a worked example, so you can check it against a job you have already done.
Quick calculators. A calculator appears where the formula is a single,
clean equation with clear symbols. It is a convenience, not an authority:
double-check every result yourself, especially doses, loads, torque and
safety-critical settings.
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Energy
1 formulas
Electrical power
MOST USED
P = V x I = I2 x R = V2 / R
SYMBOLS · P = power (W); the other two forms are handy when you know the resistance or the voltage instead of the current
UNITS · watts (W), kilowatts (kW)
HOW TO USE
For working out what a heater, a motor or a charger really uses. 1 hp is about 746 W, so a 1.5 kW heater is 2 hp of heat going into the room.
EXAMPLE
A 2,300 W kettle on 230 V draws 10 A.
power
watts
electricity
heater
motor
SOURCES & PROVENANCE
1 listed
This page is an AI-organised index. The label means the grouping and cross-links were compiled with AI; the information itself comes from the public-domain books, reports and manuals listed below. Open any source to read the local copy or follow the link to the original publication.
AI-ORGANISED INDEX
Runchero formula index
index
AI-organised depot index
The index is AI-organised; the linked sources are not.
Formulas collected and indexed with AI. The calculators are convenience tools; double-check every result before using it.