7. An electric heater is rated at 1000 W, a toaster is rated at 1500 W,...

7. An electric heater is rated at 1000 W, a toaster is rated at 1500 W, and an electric grill is rated at 2000 W. The three appliances are connected in parallel to a common 120 V circuit. (a) How much current does each appliance draw? (b) Is a 30 A circuit breaker sufficient in this situation?

8. (a) A 4 µF capacitor is connected to a 5 V battery.

(i) How much charge is stored on its plates when it is fully charged?

(ii) How much energy is stored by it when it is fully charged?

b) Three capacitors with capacitances, C1 = 1 F, C2 = 2 F, and C3 = 3 F, are connected to a 5-V source. What is the effective capacitance when the capacitors are connected in (i) series, (ii) parallel

Expert Solution

12

genius_generous answered 2 years ago

a water pumping company wants to purchase an electric motor rated at 15 Hp for 1000$(...

a water pumping company wants to purchase an electric motor rated at 15 Hp for 1000$( 1 HP= 0.7457kw ). the service life of motor is known to be 10 years with negligible salvage value.its full load efficiency is 85%. the cost of energy is 0.08$ per kWhr. the intended of the motor is 4000 hours per year .Determine the present worth for the total cost of owning and operating the motor at 10% interest rate A-19,695 $ B- 26,875...

How are electric motors rated?

An electric heater is really just a resistor with a voltage across it. If you want...

An electric heater is really just a resistor with a voltage across it. If you want to have 682 W of heat with a voltage V = 112 volts, what resistance (Ω) should the heater coil have?

Soru 4) At atmospheric pressure, it is boiled in a steel pot with an electric heater...

Soru 4) At atmospheric pressure, it is boiled in a steel pot with an electric heater from below. Calculate the heat flux transferred from the surface to the water when the surface temperature is 120 oC. Compare with the critical heat flux for bubbly boiling. Take the necessary values for the calculations from the tables.

When plugged into a standard outlet in the United States, a toaster oven uses 1600 W...

When plugged into a standard outlet in the United States, a toaster oven uses 1600 W att of power (on average). (a.) On a power (watt) vs. time (seconds) graph, plot the power used by the toaster oven. For full points, your graph must use every tick mark, must show two cycles and must label both the time and peak current values. Assume that t = 0 corresponds to a time when the power is at its maximum value. (b.)...

An electric space heater has a Nichrome heating element with a resistance of 6 Ω at...

An electric space heater has a Nichrome heating element with a resistance of 6 Ω at 20°C. When 120 V are applied, the electric current heats the Nichrome wire to 1004°C. The temperature coefficient of resistivity of Nichrome is 4 x 10-4 K-1. (a) What is the initial current drawn by the cold heating element? (b) What is the resistance of the heating element at 1004°C? (c) What is the operating wattage of this heater?

1.The specs of electric water heater say 1KW and 120V. The wires connecting it to the...

1.The specs of electric water heater say 1KW and 120V. The wires connecting it to the power source have resistance of 0.5 ohm. What is the actual voltage on water heater? How much power is wasted in the wires and how much power water heater actually consumes? 2.An external 14ft by 9ft wall is made of 8 inches thick concrete blocks. It has a 3ft by 4ft glass window which is ¼ inch thick. [10] a) Find the R-values of...

Please include diagrams: a) A 100-W light bulb and a 40-W light bulb are both rated...

Please include diagrams: a) A 100-W light bulb and a 40-W light bulb are both rated at household voltage. i) Which light bulb will be brighter if the two bulbs are connected in parallel and this combination connected to a household voltage source? ii) Which light bulb will be brighter if they are connected in series and this combination connected to a household voltage? b) A battery charges a parallel plate capacitor. After it is fully charged, it is then...

A civil engineering model for W W , the weight (in units of 1000 pounds) that...

A civil engineering model for W W , the weight (in units of 1000 pounds) that a span of a bridge can withstand without sustaining structural damage is normally distributed. Suppose that for a certain span W ∼ N ( 350 , 35 2 ) . Suppose further that the weight of cars traveling on the bridge is a random variable with mean 3.5 and standard deviation 0.35 . Approximately how many cars would have to be on the bridge...

in electric heater, why when we touch it is not conducive? also how can only the...

in electric heater, why when we touch it is not conducive? also how can only the heater heats up while the wire is cold????

Question