How many 190W lightbulbs can you use in a 180-V circuit without tripping a 8-A circuit breaker? (The bulbs are connected in parallel, which means that the potential difference across each lightbulb is 180V. Also
calculate the resistance of the 190W lightbulb.
(a) No. of 190-W lightbulbs we can use without tripping a 8-A circuit breaker=
(b) Resistance of 190W lightbulb in ohm =

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Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =