Quick questions on Electric and hybrid drive systems: HSC Engineering Studies Personal and Public Transport

A pure battery electric vehicle has:

A parallel hybrid has both the engine and the electric motor mechanically connected to the wheels through a clutch or planetary gearset (Toyota Corolla Hybrid, Hyundai Tucson Hybrid). Either can drive alone, or together for peak power.

$$\text{Range} = \frac{E_{\text{usable}}}{e_{\text{consumption}}}$$

In a BEV or hybrid, the traction motor doubles as a generator during deceleration. Kinetic energy of the vehicle is converted back to electrical energy and stored in the battery. Typical recovery is 60 to 70 percent of the kinetic energy during gentle braking (limited by the rate at which the battery can accept charge). Friction brakes still handle hard stops.

Tesla (Model 3 and Model Y) and BYD lead Australian EV sales. The Hyundai Kona Electric, Nissan Leaf, MG ZS EV and Polestar 2 round out the volume segment. Australian-made EV conversions of vintage cars (Jaguar Land Rover Classic, the SEA-Drift) are a niche industry. The NSW government's EV strategy includes a $3000 rebate (since superseded) and the Electric Vehicle Council of Australia tracks industry growth.

kW measures power (instantaneous); kWh measures energy (capacity). A 60 kWh battery charged at 10 kW takes 6 hours. A 60 kWh battery charged at 100 kW takes about 36 minutes (limited by thermal management).

Series, parallel and series-parallel architectures are different machines.

Tailpipe emissions are zero for a BEV, but upstream electricity generation and battery manufacturing produce emissions. On the Australian grid (40 percent renewable in 2026), the BEV still wins on lifecycle emissions, but the gap is smaller than the tailpipe comparison suggests. :::