Construction
Plastering Ratio: Cement and Sand Ratio for Plastering
The plastering ratio sets the strength, the cost, and how the plaster works under the trowel. This guide…
Guides & Formulas
In-depth guides, formulas, and how-tos for engineering, trades, and everyday calculations. Learn the method, then use the matching free calculator.
Physics
Centripetal Force Formula: F = mv²/r Explained
Any object moving in a circle is pulled toward the centre, and the centripetal force formula gives the…
Physics
Thermal Expansion Formula: ΔL = αLΔT Explained
Most materials grow when heated and shrink when cooled. The formula for thermal expansion tells you how much,…
Physics
Heat Transfer Formula: Q = mcΔT Explained
Heating a material takes energy, and the equation for heat transfer tells you how much. This guide covers…
Physics
Velocity and Acceleration Formulas Explained (With Examples)
Velocity and acceleration are the two ideas at the heart of motion, and the formula for velocity and…
Mechanical
Torque Formula: How to Calculate Torque (T = F x r)
Torque is the turning effect of a force, and the formula for torque is one of the most…
Electrical
Voltage Divider and Current Divider Formula Guide
The voltage divider formula and the current divider formula are two of the first tools every electronics beginner…
Electrical
Resistor Color Code Chart: How to Read Resistor Bands
The coloured bands on a resistor tell you its value, and a resistor color code chart is all…
Electrical
Cable Size Chart & Voltage Drop Formula Explained
Sizing a cable comes down to two checks: it must carry the current without overheating, and it must…
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