Heat energy is often measured in calories and 1 calorie = 4.184 Joule. It is desired to design a heating element to boil a certain amount of water in 2 min requiring 40-kcal heat energy. If the heater is to operate at 110-V, calculate
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Heat energy is often measured in calories and 1 calorie = 4.184 Joule. It is desired to design a heating element to boil a certain amount of water in 2 min requiring 40-kcal heat energy. If the heater is to operate at 110-V, calculate its current and power ratings.
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- The base on an incandescent lamp with a tungsten filament is marked 120V, 60W. Measurement of the resistance of the lamp on a Wheatstone bridge indicates 20 ohms at an ambient temperature of 20 deg C. What is the normal operating temperature of incandescence of the filament if the resistance – temperature coefficient of the tungsten filament is 1/180 at 0 deg C.3. The figure on the left below shows a schematic diagram of a battery. The voltage measured by U1 is called the terminal voltage given R1 = 1 ohm. In the figure on the right below, the terminal voltage of each of the battery-resistor combination is Vr = 1.5 volts. Find the following: a. The current passing through R5. b. The currents passing through R1 and R3 C. The voltage across R1. d. The voltage of the battery EMF. e. The percentage of voltage loss ot the battery due to the internal resistance R1. The power dissipated by the internal resistance R1. g. The power dissipated by R5 if R1 = R2 = R3 = R4 = 0. h. The percentage of power dissipation loss due to the four resistors R1, R2, R3, and R4 f. R1 R3 S10 R1 U1 1.500 EMF EMF R5 100 V1 R2 $10 EMF R4 EMF EMFIn the figure the ideal batteries have emfs ɛ1 = 20.4 V, ɛ2 = 9.05 V, and ɛ3 = 5.40 V, and the resistances are each 2.40 Q. What are the (a) size and (b) direction (left or right) of current i,? (c) Does battery 1 supply or absorb energy, and (d) what is its power? (e) Does battery 2 supply or absorb energy, and (f) what is its power? (g) Does battery 3 supply or absorb energy, and (h) what is its power? (a) Number i Units (b) (c) (d) Number i Units (e) (f) Number i Units (g) (h) Number i Units