Two appliances rated 500W and 400W are connected to 110V household power line on a circuit breaker rated 10A. What is the maximum power of a third appliance that can be connected to trip the breaker? 800 W 200 W 300 W 400 W
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- Two appliances rated 500W and 400W are connected to 110V household power line on a circuit breaker rated 10A. What is the maximum power of a third appliance that can be connected to trip the breaker?
- 800 W
- 200 W
- 300 W
- 400 W
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- A voltage V(t) = Vm sin(wt) is applied across a 49 ohm resistor. What is the average power in Watts dissipated in the resistor? Vm = 12 voltsI have a computer that consumes a maximum of 15 W of power and I use a 5000 mAh battery. How long will it last at maximum power draw assuming it uses 20 V.60 W 30 W Bulb A Bulb B V,-120V Vs-120V PA-60W Pa-30w Light bulb A has a power rating of 60 W when plugged into a 120 v outlet. Bulb B has a power rating of 30W when plugged into the same 120V outlet. Which of the following are correct statements? SELECT TWO ANSWERS a. Bulb A has twice the resistance of bulb B b. The following equation relates the current through each bulb la = 218 c. If both bulbs were turned on for 5 minutes bulb B would use twice the energy of bulb A O d. Bulb A has half the resistance of bulb B
- You are given the job of evaluating potential power line systems. One system is designed to operate at V = 3000 V, and another would operate at V = 6500 V. Suppose the power line at the higher voltage would dissipate 3 % of the power that it carries. What percentage of the power would be dissipated in the low-voltage power line?A 120 volt household circuit has a 20 amp circuit breaker (maximum). A 600-Watt heater and a 60 ohm light are connected to this source in parallel: A) What is the current through the 60 ohm light? B) What is the resistance of the 600-Watt heater? C) What is the minimum resistance R which could be used in parallel as a third appliance without tripping the 20 amp circuit breaker?A physics student has a single-occupancy dorm room. The student has a small refrigeratorthat runs with a current of 3.00 A at a voltage of 110 V, a lamp that contains a 100-W bulb,an overhead light with a 60-W bulb, and various other small devices adding up to 3.00 W. a. Assuming the power plant that supplies 110 V electricity to the dorm is 10 km awayand the two aluminum transmission cables use 0-gauge wire with a diameter of8.252 mm, estimate the percentage of the total power supplied by the powercompany that is lost in the transmission if the power is transmitted at 110 V. Hint:treat the transmission cables as cylinders and calculate the cable’s resistance fromits length, diameter, and resistivity. b. What would be the result if the power company transmitted the electric power at110 kV?
- A heart defibrillator being used on a patient has an RC time constant of 11 ms due to the resistance of the patient's body and the capacitance of the defibrillator. If the defibrillator has an 8.5 μF capacitance, what is the resistance of the path through the patient in kΩ? (You may neglect the capacitance of the patient's body and the resistance of the defibrillator.) If the initial voltage is 12.5 kV, how long does it take to decline to 6.00 × 102 V in ms?The cord from an appliance is too short to reach the wall outlet in your room. You have two extension cords to choose from. a) Find the voltage drop in the first extension cord having a 0.0780 Ω resistance and through which 7.60 A is flowing. b)The second extension cord is cheaper and utilizes thinner wire. It has a resistance of 0.780 Ω and the current flowing through it is 7.60 A. By what amount does the voltage supplied to the appliance change when the first extension cord is replaced by the second?