2. Figure 1 shows an electric iron rated 2000 W, 240 V connected to a 240 V supply through a copper wire of total length 32.0 m (16.0 mx 2). The copper wire has resistivity of 1.8x 10- 2 m. insulation Heating element of the electric iron copper wire cable 240 V 2000 W 16.0 m 240 V tHearh a) Show that the resistance of the heating element of the iron is 28.8 2. b) When the switch S is closed, the voltage across the electric iron drops to 230 V. Determine: (i) the resistance of the copper wire (ii) the cross-sectional area of the copper wire. The resistance of the part of the copper wire out of the insulation is negligible.
2. Figure 1 shows an electric iron rated 2000 W, 240 V connected to a 240 V supply through a copper wire of total length 32.0 m (16.0 mx 2). The copper wire has resistivity of 1.8x 10- 2 m. insulation Heating element of the electric iron copper wire cable 240 V 2000 W 16.0 m 240 V tHearh a) Show that the resistance of the heating element of the iron is 28.8 2. b) When the switch S is closed, the voltage across the electric iron drops to 230 V. Determine: (i) the resistance of the copper wire (ii) the cross-sectional area of the copper wire. The resistance of the part of the copper wire out of the insulation is negligible.
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Transcribed Image Text:2. Figure 1 shows an electric iron rated 2000 W, 240 V connected to a 240 V supply through a copper wire of
total length 32.0 m (16.0 mx 2). The copper wire has resistivity of 1.8x 10-3 2 m.
deamme
Hears
copper wire
insulation
cable
Heating element
of the electric iron
240 V
2000 W
16.0 m
240 V
a) Show that the resistance of the heating element of the iron is 28.8 2.
b) When the switch S is closed, the voltage across the electric iron drops to 230 V. Determine:
(i) the resistance of the copper wire
(ii) the cross-sectional area of the copper wire.
The resistance of the part of the copper wire out of the insulation is negligible.
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