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If the magnitude of the drift velocity of free electrons in a copper wire is 7.84 x 10-4 m/s, what is the electric field in the conductor? (for copper
n = 8.49 × 10 28 electron/m 3
ρ = 1.7 × 10−8 Ω⋅m
A 0.900V potential difference is maintained across a 1.50m length of tungsten wire that has a cross-sectional area of 0.600 mm2. What is the current in the wire?
A certain toaster has a heating element made of*Nichrome resistance wire. When the toaster is first connected to a 120-V source of potential difference (and the wire is at a temperature of 20.0°C), the initial cur-rent is 1.80A. However, the current begins to decrease as the resistive element warms up. When the toaster has reached its final operating temperature, the current has dropped to 1.53A. (a) Find the power the toaster consumes when it is at its operating temperature. (b) What*is the final temperature of the heating element?
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