Flashlight batteries. A typical small flashlight contains two batteries, each having an emf of 1.5 V. connected in series with a bulb having resistance 17 Ω. (a) if the internal res stance of the batteries is negligible, what power is delivered to the bulb? (b) if the batteries last for 5.0 h, what is the total energy delivered to the bulb? (c) The resistance of real batteries increases as they run down. If the initial internal resistance is negligible, what is the combined internal resistance of both batteries when the power to the bulb has decreased to half its initial value? (Assume that the resistance of the bulb is constant. Actually, it will change somewhat when the current through the filament changes, because this changes the temperature of the filament and hence the resistivity of the filament wire.)
Flashlight batteries. A typical small flashlight contains two batteries, each having an emf of 1.5 V. connected in series with a bulb having resistance 17 Ω. (a) if the internal res stance of the batteries is negligible, what power is delivered to the bulb? (b) if the batteries last for 5.0 h, what is the total energy delivered to the bulb? (c) The resistance of real batteries increases as they run down. If the initial internal resistance is negligible, what is the combined internal resistance of both batteries when the power to the bulb has decreased to half its initial value? (Assume that the resistance of the bulb is constant. Actually, it will change somewhat when the current through the filament changes, because this changes the temperature of the filament and hence the resistivity of the filament wire.)
Flashlight batteries. A typical small flashlight contains two batteries, each having an emf of 1.5 V. connected in series with a bulb having resistance 17 Ω. (a) if the internal res stance of the batteries is negligible, what power is delivered to the bulb? (b) if the batteries last for 5.0 h, what is the total energy delivered to the bulb? (c) The resistance of real batteries increases as they run down. If the initial internal resistance is negligible, what is the combined internal resistance of both batteries when the power to the bulb has decreased to half its initial value? (Assume that the resistance of the bulb is constant. Actually, it will change somewhat when the current through the filament changes, because this changes the temperature of the filament and hence the resistivity of the filament wire.)
A resistor with resistance 31.5 Q is connected to the terminals of a voltage source.
(a) Calculate the current through the resistor when the voltage is set at 7.00 V.
A
(b) Calculate the power dissipated by the resistor when the voltage is set at 7.00 V.
W
(c) If the voltage is doubled, recalculate the power.
W
A lithium ion battery has an emf of 14.00 V but a terminal voltage of
AVab = 7.00 V is measured when an 3.00 A current is drawn from the
battery. How much power is dissipated as heat by the battery's
internal resistance, r?
Provide the solution:
W
a
r
A battery with emf, & = 15 V, has a terminal voltage of 12.8 V when it is
delivering 18.5 W of power to a circuit resistor with unknown resistance, R.
(a) Find the resistance of the unknown resistor.
R =
Ω
(b) What is the internal resistance of the battery?
Ω
r =
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How To Solve Any Resistors In Series and Parallel Combination Circuit Problems in Physics; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=eFlJy0cPbsY;License: Standard YouTube License, CC-BY