Quelpr
3 marksPower, P

CSEC Physics · January 2011 · Paper 2 · Question 5(b)(iii)

To make electric cars more efficient, they will need to be charged regularly using a magnetic field below the road surface. One solution is to designate one lane of the highway for recharging batteries.

In a certain section of road, 200 KW of power is expended to charge 100 cars. If each car converts 600 Watts of power to charging the battery, calculate the conversion efficiency.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 5(a)With the aid of at least one diagram, describe how the magnitude of the electromotive force (e.m.f.) induced in a conductor depends on the rate of change of…[6 marks]
  2. 5(b)(i)In the charging lane cars are required to keep moving. Why should this be so?[3 marks]
  3. 5(b)(ii)Assuming the magnetic field is constant, state with reason, how the speed of the car will affect the charging of the batteries.[3 marks]

More practice: the rest of this paper · more Power, P questions · all CSEC Physics past papers