An electric heater has a resistance of $690 \Omega$ and is designed to operate at 230 V . What are the characteristics of a good heating coil ? Calculate the heat energy produced by this heater when it works for 30 minutes.
Explanation
A good heating coil should have low resistance, high melting point, and be able to withstand high temperatures. The heat energy produced by the heater can be calculated using the formula Q = V^2/R*t, where Q is the heat energy, V is the voltage, R is the resistance, and t is the time in seconds. Given that the resistance is 690 Ω, voltage is 230 V, and time is 30 minutes (1800 seconds), the heat energy produced is Q = (230)^2/(690)*1800 = 90480 J.
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