Ohm's law is a fundamental law of electrical engineering. It describes the relationship between voltage , current, and resistance – and is also relevant for understanding e-bike electronics .

The formula of Ohm's law

Ohm's law states:

U = R × I

• U = Voltage (Volts)

• R = electrical resistance (Ohm)

• I = Current (Amperes)

It shows that the greater the resistance, the lower the current flow – at a constant voltage.

Application for e-bikes

In e-bikes, Ohm's law is used wherever electricity flows:

• in the engine

• in the controller

• in cables and connectors

• in the battery

Example: If the resistance increases due to poor contacts or damaged cables, the current decreases – the motor loses power.

Why resistance is important

Excessive electrical resistance can:

• energy losses cause

• Increase heat generation

• reduce the efficiency of the drive system

Therefore, high-quality connectors, clean contacts and suitable cable cross-sections are particularly important for e-bikes.

Practical relevance

Ohm's law helps to understand electrical problems, such as:

• why an e-bike delivers less power under load

• why components heat up

• how voltage dips affect range