Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 25, Problem 30P
(a)
To determine
The the current in the laser beam.
(b)
To determine
The power of the laser beam.
(c)
To determine
The time period one cancontinuously operate the laser pointer before replacing the batteries.
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A battery has a terminal voltage of 6.0 V when no current flows. Its internalresistance is 1.0 Ω. A 5.0-Ω resistor is connected across the battery terminals.
(a) Calculate the current flowing through the resistor.
(b) What voltage would a voltmeter measure across the battery terminals with the 5.0-Ω resistor connected to the battery?
A resistor with resistance 28.5 Q is connected to the terminals of a voltage source.
(a) Calculate the current through the resistor when the voltage is set at 9.00 V.
A
(b) Calculate the power dissipated by the resistor when the voltage is set at 9.00 V.
W
(c) If the voltage is doubled, recalculate the power.
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During an experiment to verify Ohm's law, the voltage supplied and the current through a circuit are measured.
[Voltage is measured in Volt (V) and current in Ampere (A)].
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R
on
Battery
The measured value of the current is I = 3.1 ± 0.2 A and that of the voltage is V = 14 0.5 V. The resistance of
the circuit (in N) can be calculated using the formula, R = V/I,
Calculate the,
a) Resistance (in 2) =
b) Fractional uncertainty in the resistance =
c) Absolute uncertainty (in 2) in the resistance=
Chapter 25 Solutions
Physics for Scientists and Engineers
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- Resistors are commonly rated at 18W,14W,12W ,1 W and 2 W for use in electrical circuits. If a current of1 = 2.00 A is accidentally passed through a R=1.00 resistor rated at 1 W, what would be the most probable outcome? Is there anything that can be done to prevent such an accident?arrow_forwardPower P0 = I0 V0 is delivered to a resistor of resistance R0. If the resistance is doubled (Rnew = 2R0) while the voltage is adjusted such that the current is constant, what are the ratios (a) Pnew/P0 and (b) Vnew/V0? If, instead, the resistance is held constant while Pnew = 2P0, what are the ratios (c) Vnew/V0, and (d) Inew/I0?arrow_forwardIf the terminals of a battery with zero internal resistance are connected across two identical resistors in series, the total power delivered by the battery is 8.00 W. If the same battery is connected across the same resistors in parallel, what is the total power delivered by the battery? (a) 16.0 W (b) 32.0 W (c) 2.00 W (d) 4.00 W (e) none of those answersarrow_forward
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- Although an ideal voltmeter has an infinite internal resistance, this theoretical ideal is usually not met in practice. The voltmeter in the Figure has an internal resistance of 2 x 109 Ω and is used to measure the voltage across the resistor R2 as shown. Attaching this non-ideal voltmeter decreases the voltage across R2. Calculate the magnitude of this decrease using an emf of 10 V and R1 = R2 = 150 kΩ.arrow_forwardTwo resistors R1 and R2 may be connected either in series or in parallel across an ideal battery with emf e.We desire the rate of energy dissipation of the parallel combination to be five times that of the series combination. If R1 = 100 ohm, what are the (a) smaller and (b) larger of the two values of R2 that result in that dissipation rate?arrow_forward(a) When measuring the voltage across a resistor and the current through it, the voltmeter and the ammeter should be connected in respectively, to the resistor. series and series series and parallel O parallel and series O parallel and parallel (b) The resistances of an ideal voltmeter and ammeter should be infinity and zero infinity and infinity zero and infinity zero and zero respectively. Hint: Voltage is the measure of difference of the potential between two different points. Current is the measure of the flow of electrons.arrow_forward
- (b) The load resistance RL is replaced by a network of resistors R1 = 20 Ω, R2 = 30 Ω and R3 = 50 Ω shown in the Figure Q11(b). (i) Find the equivalent resistance across AB.(ii) Find the voltage VAB across AB.arrow_forwardWhen a R = 88.7 Q resistor is connected across a 11.1 V battery, a current of 112.8 mA flows. What is the internal resistance of the battery and Terminal voltage of the battery? (1) E(MF) Rexternal external Rinterna (a) internal resistance of the battery(in 2) = (b) Terminal voltage of the battery in V = .--- Batteryarrow_forwardWhy would batteries with high current capacity have a lower internal resistance than batteries with a low current capacity? Consider the difference between 12 V car batteries and 12 V flashlight batteries. While both batteries supply the same voltage (12 V) of EMF, they have considerably different applications. Use V = E - Ir to explain the answerarrow_forward
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