Which transmission type is typically found in most electric cars?

Most electric cars typically use a single-speed gearbox, also called a fixed-ratio reduction gear.

An electric motor produces useful torque across a much wider speed range than a conventional internal-combustion engine. It can deliver strong torque from rest and continue operating at high rotational speed, so an EV usually does not need several selectable ratios to keep the motor in an efficient band. A fixed reduction gear lowers motor speed and increases torque at the wheels.

This arrangement is simpler than a manual or multi-speed automatic transmission. It eliminates gear changes, a clutch and many moving parts, which contributes to smooth acceleration and can reduce mechanical complexity and maintenance. Reverse is also usually achieved by running the motor in the opposite direction rather than adding a separate reverse gear.

The answer describes the common arrangement, not an absolute rule. Some electric vehicles use two-speed transmissions to improve launch performance, efficiency or high-speed capability. The Porsche Taycan, for example, uses a two-speed gearbox on its rear axle. Nevertheless, single-speed drive units remain the standard layout for most passenger EVs.