Suppose you have three identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of its brightness. You add a second lightbulb, connecting it in parallel with the previous lightbulbs, and again take note of the brightness. Repeat the process with the third lightbulb, connecting it in parallel with the other two. As the lightbulbs are added, the
brightness of the lightbulbs (neglect the battery’s internal resistance)
1.increases.
2.decreases.
3.remains the same.
4.Need more information.
3
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What led Kepler to abandon circular orbits and his discovery that planetary orbits are ellipses?
A) a deviation between observed and model values that was much larger than the observation uncertainties B) a desire to gain prestige by using a more complicated model C) the observation of a comet moving on a highly eccentric orbit
A 1.56-V battery has an internal resistance of 0.120
What is the maximum current that can be drawn from this battery?
A. infinite (or at least 1000's of amps) B. 1.56 A C. 0.190 A D. 13.0 A E. 7.50 A
A DC motor of internal resistance 6.0 ? is connected to a 24-V power supply. The operating current is 1.0 A
(a) What is the start-up current? (b) What is the back emf when the motor is running at full speed? (c) What is the back emf when the motor is running at half speed?
Four unequal resistors are connected in a series circuit. Which one of the following statements is correct about this circuit?
A) The total resistance is equal to any one of the resistors. B) The total resistance is equal to average of the four resistors. C) The total resistance is less than the smallest resistor. D) The total resistance is less than the largest resistor. E) The total resistance is more than the largest resistor.