How tools actually work, and how to choose one
Find Tool Editorial Team 
Voltage tells you roughly how much electrical “push” a battery can deliver to the motor, which relates to potential power and speed. Amp-hours tell you how much energy the battery stores, which relates to how long it runs before needing a charge. Neither number, on its own, tells you how good the tool actually is. … Read more
Brushless means the motor has no small carbon contacts rubbing against a spinning commutator to deliver electricity to the coils. Instead, a control board switches current electronically to spin the motor. The result is usually less wasted heat, less internal friction, and a motor that can be run and controlled more precisely — but it … Read more
A drill spins a bit to bore holes or drive light screws. An impact driver adds rapid rotational hammer blows to drive long screws and bolts without stalling. A hammer drill adds forward-hitting blows to bore into brick, block and concrete. Each tool trades smooth control for extra force in a different direction. What does … Read more
A cordless drill is built to bore round holes cleanly through wood, metal or masonry, using a chuck that grips round-shank bits and a motor tuned for steady rotation. A driver is built to turn screws, using a hex collet, a clutch that limits torque, and often an impact mechanism that delivers sharp rotational hits … Read more
About what you read here. Everything on Find Tool is general information and our own editorial opinion. We research carefully and we say when the evidence is unclear, but we can be wrong, things change, and no article can know your particular situation. Please do your own research and make your own judgement rather than treating anything here as the final word. Prices, products and specifications around tools and workshop equipment change constantly, and what suits one person will not suit another. Check current details yourself, and where a decision involves real money, safety or something you cannot undo, it is worth confirming with the manufacturer, or a qualified electrician or tradesperson before you act.