Cambridge Secondary (7-9). Stage 9. Science. Learner's Book - Unit 3: Forces and energy - Question 96

Think like a scientist: Temperature change from heat dissipation. Work in groups of two or three. Use a 2 V or 6 V lamp, holder, cells, wires, connectors, a 50 cm³ (or smaller) beaker, water, thermometer and timer. This experiment must be done in the school laboratory with teacher supervision. Only the glass part of the lamp is in the water. Never put a lamp in water at home. Set up as shown, use a small volume of water, record its temperature, switch on the lamp and record temperature every minute until it stops changing.



Explain the change in temperature of the water in the first few minutes after switching on the lamp.