Highlig! Question 1 (a).i. An electric heating element to dissipate 580W on 240V is to be made from nichrome ribbon 1mm wide and thickness of 0.005mm. Calculate the length of the ribbon required if the resistivity of nichrome is 1. 1x 100m. (6marks) 1. The resistance of a coil aluminum wire at 21°C is 2100. The temperature of the wire is increased and the resistance rises to 2400. If the coefficient of resistance of aluminum is 0.0039/c at 21°C, determine the temperature to which the coil has risen. (7marks) b) A
+ 10 Page view A Read aloud V Draw Highlig! Question 1 (a).i. An electric heating element to dissipate 580W on 240V is to be made from nichrome ribbon 1mm wide and thickness of 0.005mm. Calculate the length of the ribbon required if the resistivity of nichrome is 1. 1x 100m. (6marks) 1. The resistance of a coil aluminum wire at 21°C is 2100. The temperature of the wire is increased and the resistance rises to 2400. If the coefficient of resistance of aluminum is 0.0039/c at 21°C, determine the temperature to which the coil has risen. (7marks) b) A capacitor is constructed with parallel plates and has a value of 50pF. What would be the capacitance of the capacitor if the plate area is doubled and the plate spacing is halved? (7marks) c) Calculate the current / that will flow through the circuit shown below: 16Ω 1.50 20 24 V 60 502 30 (5marks
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