Articles

A kWh (kilowatt-hour) is a unit of energy equal to a 1,000-watt device running for one full hour. See the formula, kWh = kW x hours, with worked examples.

Bandwidth vs speed explained simply: bandwidth is a connection’s maximum capacity, while speed is the actual data rate you experience day to day.

Learn how to estimate file download time from file size and connection speed, with a step-by-step formula, a worked example, and real unit tips.

Data storage units KB, MB, GB, and TB explained clearly, covering decimal vs binary counting and why a drive shows less space than the label promises.

A bit is one 0 or 1. A byte is a group of 8 bits. See why network speeds use bits (Mbps) but file sizes use bytes (MB), plus a worked conversion example.

Expected value explained simply: the formula, a fair-die example, and a coin-flip example. See why EV is a long-run average, not a guaranteed outcome.

Correlation vs causation explained in plain terms: why two variables moving together never proves one causes the other, plus the classic confounding example.

Combinations vs permutations explained plainly: permutations count order, combinations do not. See both formulas and a worked example side by side.

Probability vs odds explained simply: probability is a fraction of outcomes, odds is a ratio of wins to losses, with formulas to convert between them.

A confidence interval is a range of values likely to hold the true population mean. See the formula, a full worked example, and what changes its width.