Question 98
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.
An LED is a device that changes electrical energy to light energy. LEDs change a bigger percentage of electrical energy to light energy than a lamp. Use this information to predict any differences in results if the experiment were repeated with an LED. Assume everything else in the experiment stays the same.
An LED is a device that changes electrical energy to light energy. LEDs change a bigger percentage of electrical energy to light energy than a lamp. Use this information to predict any differences in results if the experiment were repeated with an LED. Assume everything else in the experiment stays the same.
