The 120 V electric heater in a coffee maker has a resistance of 15 Ω.
How long will it take for this heater to raise 8 cups (1760 g) of water from 20∘C to the ideal brewing temperature of 90∘C?
The 120 V electric heater in a coffee maker has a resistance of 15 Ω. How...
The 120 V electric heater in a coffee maker has a resistance of 15 Ω. How long will it take for this heater to raise 7 cups (1540 g) of water from 20∘C to the ideal brewing temperature of 90∘C? Express your answer in minutes.
Part A : The resistance of an electric heater is 90 Ω when connected to 120 V. How much energy does it use during 15 min of operation? (answer in J) Part B : The lightbulb used in a computer projector has a resistance of 71 Ω. What is the current through the bulb when it is operating on 120 V? ( answer in A )
8. An electric heater with a resistance of 14.4 Ω is designed to operate at 120 V. What is its power? 1400 W 0150w 0240 W O 1000 w
An electric heater is used to boil small amounts of water and consists of a 10-Ω coil that is immersed directly in the water. It operates from a 120-V socket. How much time is required for the heater to raise the temperature of 0.38 kg of water from 29 °C to the normal boiling point? Take the specific heat capacity of water to be 4186 J/(kg·C°).
5. An electric heater has a Nichrome heating element with a resistance of 9 Ω at 20°C. When l 16 V are applied, the electric current heats the Nichrome wire to 1060 C What is the operating wattage of this heater? The temperature coefficient of resistivity of Nichrome is α-0.0004 C Watts
3. a) An electric water heater uses 5500 W (240 V) of electrical power. It has a capacity of 40 gallons (150 liters or 150 kg). If the initial temperature of the water in the water heater is 20° C, how long will it take to heat the water to a final temperature of 60° C at 100% efficiency? b) How long will it take to heat the water to a final temperature of 60°C at 80% efficiency? c)If electrical...
An electric heater has a Nichrome heating element with a resistance of 7 Ω at 20oC. When 118 V are applied, the electric current heats the Nichrome wire to 980oC. What is the operating wattage of this heater? (The temperature coefficient of resistivity of Nichrome is α = 0.0004 Co-1)
A space heater and coffee pot are connected in parallel to same 120-V wall outlet. You know they draw a cumulative 100 W of power, and the resistance of the space heater is 125 Ω. What is the resistance of the coffee pot?
A 1500-W heater is designed to be plugged into a 120-V outlet. What current will flow through the heating coil when the heater is plugged in? I = A What is R , the resistance of the heater? How long does it take to raise the temperature of the air in a good-sized living room 3.0m x 5.0m x 8m by 10 degrees C? Note that the specific heat of air is 1006 J/(kg x degrees C) and the density...
A 540 W electric heater is designed to operate at 120 V. What current does it draw? (1 point) 04.50 A 03.22 A 26.7 A 2.25 A (1 point) 6. An electric heater with a resistance of 14.4 Ω is designed to operate at 120 V. What is its power? O1400 W 150 W O240 W 1000 W