An incandescent lightbulb rated at 60 W will dissipate 60 W as heat and light when connected across a 100 V ideal voltage source. A 100-W bulb will dissipate 100 W when connected across the same source. If the bulbs are connected in series across the same source, determine the power that either one of the two bulbs will dissipate.
What will be an ideal response?
Known quantities:
Rated power and rated voltage of the two light bulbs.
Find:
The power dissipated by the series of the two light bulbs.
Assumptions:
The resistance of each bulb doesn’t vary when connected in series.
Analysis:
When connected in series and assuming the resistance of each bulb remains the same as when connected individually:
Notes: 1.It’s strange but it’s true that a 60 W bulb connected in series with a 100 W bulb will dissipate more power than the 100 W bulb. 2. If the power dissipated by the filament in a bulb decreases, the temperature at which the filament operates and therefore its resistance will decrease. This made the assumption about the resistance necessary.
You might also like to view...
Refer to Exercise 9. Assume that the mass of the rock is 288.2 g with negligible uncertainty, the initial volume of water in the cylinder is 400 ± 0.1mL, and the volume of water plus rock is 516 ± 0.2mL. Estimate the density of the rock, and find the relative uncertainty in the estimate.
What will be an ideal response?
Technician A says that in a parallel hybrid design, only the electric motor is connected to the transmission. Technician B says that in a parallel hybrid design, the vehicle can be propelled by the electric traction motor, the internal combustion engine, or both. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
All of the following statements are correct EXCEPT ________
A) Some systems use a delta pressure feedback system to monitor EGR operation by measuring exhaust system pressure B) Linear EGR systems require exhaust backpressure C) Many vehicles use the MAP sensor to monitor EGR operation D) OBD-II vehicles require monitoring of the EGR system
The first step in the PLD programming process is ________
A) design entry B) compilation C) synthesis D) download