Q1. (a) fan drill www washing machine four circled including correct three scores 1 mark five circled scores zero (b) Appliances only transfer part of the energy usefully The energy transferred by appliances makes the surroundings warmer Q2. (a) the store of chemical energy in the battery has reduced (b) P 3.90 x 1.86 P = 7.254 W allow 7.25 or 7.3 (c) comparison with compact power source 5 times as many charges (only) twice the mass allow (only) twice as heavy as the compact comparison with the high capacity power source although half the number of charges (only) one third the mass or allow (only) a third as heavy as the high capacity calculation of charge / mass ratio for large power source = 0.025 (1) 5 200 -(1) allow mass/charge ratio 200 5 allow 40 calculation of charge / mass ratio for high capacity and compact power sources (1) allow mass/charge ratio charge / mass ratio greatest for large source (1) allow lowest mass/charge ratio