Week 5 Challenge

Question.1

b. False

The powe density of ultra capacitor is very high compared to the battery. Since the acceleration and braking is very harsh the vehicle need more power to move the vehicle according to the acceleration. Hence in hybrid vehicles the peak powers are delivered from ultracapacitors and the average powers, that is when the vehicle is moving with constant or slow speed is provided from the battery.

Question.2

	Energy density (Wh/kg)	Power density (W/kg)	Cell voltage
Lead acid battery	35	180	2
Nickel cadmium battery	30	175	1.2
Nickel metal hydride battery	100	750	1.2
Lithium ion (NCA)	220	750	3.7
Ultra capacitor	206	496	2.5

Question. 3

Question. 4

True