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Exercícios de corrente e circuitos · Physics Playground

ExercíciosFísica

Corrente e circuitos

35 problemas com soluções resolvidas, de Physics e College Physics.

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Aprenda antes: Corrente, Tensão e Resistência, Circuitos em Série e em Paralelo

Physics19.1 Ohm's law

ExemploCurrent in a Lightning StrikeA lightning strike can transfer as many as 10 ^(20) electrons from the cloud to the ground. If the strike lasts 2 ms, what is the average electric current in the lightning?
ExemploAverage Current to Charge a CapacitorIn a circuit containing a capacitor and a resistor, it takes 1 min to charge a 16 μF capacitor by using a 9-V battery. What is the average current during this time?
ExemploResistance of a HeadlightWhat is the resistance of an automobile headlight through which 2.50 A flows when 12.0 V is applied to it?Com figura
ExemploDetermine Resistance from Current-Voltage GraphSuppose you apply several different voltages across a circuit and measure the current that runs through the circuit. A plot of your results is shown in Figure 19.7. What is the resistance of the circuit? Figure 19.7…Com figura

Physics19.2 Series Circuits

ExemploCalculation of Equivalent Resistance (part 1)In the left circuit of the previous figure, suppose the voltage rating of the battery is 12 V, and the resistances are R1 =1.0Ω,R2 =6.0Ω,andR3 =13Ω. (a) What is the equivalent resistance? (b) What is the current…
ExemploDetermine the Unknown ResistanceThe circuit shown in figure below contains three resistors of known value and a third element whose resistance R3 is unknown. Given that the equivalent resistance for the entire circuit is 150 Ω, what is the…Com figura

Physics19.3 Parallel Circuits

ExemploFind the Current through Parallel ResistorsThe three circuits below are equivalent. If the voltage rating of the battery is Vbattery =3V, what is the equivalent resistance of the circuit and what current runs through the circuit?Com figura
ExemploReasoning with Parallel ResistorsWithout doing any calculation, what is the equivalent resistance of three identical resistors R in parallel?
ExemploFind the Current through a Complex Resistor CircuitThe battery in the circuit below has a voltage rating of 10 V. What current flows through the circuit and in what direction?Com figura
ExemploStrange-Looking Circuit DiagramsOccasionally, you may encounter circuit diagrams that are not drawn very neatly, such as the diagram shown below. This circuit diagram looks more like how a real circuit might appear on the lab bench. What is the…Com figura

Physics19.4 Electric Power

ExemploFind the Resistance of a LightbulbA typical older incandescent lightbulb was 60 W. Assuming that 120 V is applied across the lightbulb, what is the current through the lightbulb?
ExemploBoot WarmersTo warm your boots on cold days, you decide to sew a circuit with some resistors into the insole of your boots. You want 10 W of heat output from the resistors in each insole, and you want to run them from two 9-V…
ExemploPower through a Branch of a CircuitEach resistor in the circuit below is 30 Ω. What power is dissipated by the middle branch of the circuit?Com figura

College Physics20.1 Current

Exemplo 20.1Calculating Currents: Current in a Truck Battery and a Handheld Calculator(a) What is the current involved when a truck battery sets in motion 720 C of charge in 4.00 s while starting an engine? (b) How long does it take 1.00 C of charge to flow through a handheld calculator if a 0.300-mA…
Exemplo 20.2Calculating the Number of Electrons that Move through a CalculatorIf the 0.300-mA current through the calculator mentioned in the Example 20.1 example is carried by electrons, how many electrons per second pass through it?
Exemplo 20.3Calculating Drift Velocity in a Common WireCalculate the drift velocity of electrons in a 12-gauge copper wire (which has a diameter of 2.053 mm) carrying a 20.0-A current, given that there is one free electron per copper atom. (Household wiring often…

College Physics20.2 Ohm’s Law: Resistance and Simple Circuits

Exemplo 20.4Calculating Resistance: An Automobile HeadlightWhat is the resistance of an automobile headlight through which 2.50 A flows when 12.0 V is applied to it?

College Physics20.3 Resistance and Resistivity

Exemplo 20.5Calculating Resistor Diameter: A Headlight FilamentA car headlight filament is made of tungsten and has a cold resistance of 0.350Ω. If the filament is a cylinder 4.00 cm long (it may be coiled to save space), what is its diameter?
Exemplo 20.6Calculating Resistance: Hot-Filament ResistanceAlthough caution must be used in applying ρ=ρ0(1 +αΔT) and R=R0(1 +αΔT) for temperature changes greater than 100ºC, for tungsten the equations work reasonably well for very large temperature changes. What, then, is…

College Physics20.4 Electric Power and Energy

Exemplo 20.7Calculating Power Dissipation and Current: Hot and Cold Power(a) Consider the examples given in Ohm’s Law: Resistance and Simple Circuits and Resistance and Resistivity. Then find the power dissipated by the car headlight in these examples, both when it is hot and when it is…
Exemplo 20.8Calculating the Cost Effectiveness of Compact Fluorescent Lights (CFL)If the cost of electricity in your area is 12 cents per kWh, what is the total cost (capital plus operation) of using a 60-W incandescent bulb for 1000 hours (the lifetime of that bulb) if the bulb cost 25 cents? (b)…

College Physics20.5 Alternating Current versus Direct Current

Exemplo 20.9Peak Voltage and Power for AC(a) What is the value of the peak voltage for 120-V AC power? (b) What is the peak power consumption rate of a 60.0-W AC light bulb?
Exemplo 20.10Power Losses Are Less for High-Voltage Transmission(a) What current is needed to transmit 100 MW of power at 200 kV? (b) What is the power dissipated by the transmission lines if they have a resistance of 1.00Ω? (c) What percentage of the power is lost in the…

College Physics21.1 Resistors in Series and Parallel

Exemplo 21.1Calculating Resistance, Current, Voltage Drop, and Power Dissipation: Analysis of a Series CircuitSuppose the voltage output of the battery in Figure 21.3 is 12.0V, and the resistances are R1=1.00Ω, R2=6.00Ω, and R3=13.0Ω. (a) What is the total resistance? (b) Find the current. (c) Calculate the voltage drop in…
Exemplo 21.2Calculating Resistance, Current, Power Dissipation, and Power Output: Analysis of a Parallel CircuitLet the voltage output of the battery and resistances in the parallel connection in Figure 21.4 be the same as the previously considered series connection: V=12.0 V, R1=1.00Ω, R2=6.00Ω, and R3=13.0Ω. (a) What is the…
Exemplo 21.3Calculating Resistance, IR Drop, Current, and Power Dissipation: Combining Series and Parallel CircuitsFigure 21.6 shows the resistors from the previous two examples wired in a different way—a combination of series and parallel. We can consider R1 to be the resistance of wires leading to R2 and R3. (a) Find the total…Com figura
ChecagemCan any arbitrary combination of resistors be broken down into series and parallel combinations? See if you can draw a circuit diagram of resistors that cannot be broken down into combinations of series and parallel.

College Physics21.2 Electromotive Force: Terminal Voltage

Exemplo 21.4Calculating Terminal Voltage, Power Dissipation, Current, and Resistance: Terminal Voltage and LoadA certain battery has a 12.0-V emf and an internal resistance of 0.100Ω. (a) Calculate its terminal voltage when connected to a 10.0-Ω load. (b) What is the terminal voltage when connected to a 0.500-Ω load? (c) What…

College Physics21.3 Kirchhoff’s Rules

Exemplo 21.5Calculating Current: Using Kirchhoff’s RulesFind the currents flowing in the circuit in Figure 21.25. Figure 21.25 This circuit is similar to that in Figure 21.21, but the resistances and emfs are specified. (Each emf is denoted by script E.) The currents in…Com figura
ChecagemCan Kirchhoff’s rules be applied to simple series and parallel circuits or are they restricted for use in more complicated circuits that are not combinations of series and parallel?

College Physics21.4 DC Voltmeters and Ammeters

ChecagemDigital meters are able to detect smaller currents than analog meters employing galvanometers. How does this explain their ability to measure voltage and current more accurately than analog meters?

College Physics21.5 Null Measurements

ChecagemIdentify other factors that might limit the accuracy of null measurements. Would the use of a digital device that is more sensitive than a galvanometer improve the accuracy of null measurements?

College Physics21.6 DC Circuits Containing Resistors and Capacitors

Exemplo 21.6Integrated Concept Problem: Calculating Capacitor Size—Strobe LightsHigh-speed flash photography was pioneered by Doc Edgerton in the 1930s, while he was a professor of electrical engineering at MIT. You might have seen examples of his work in the amazing shots of hummingbirds in…
Exemplo 21.7Calculating Time: RC Circuit in a Heart DefibrillatorA heart defibrillator is used to resuscitate an accident victim by discharging a capacitor through the trunk of her body. A simplified version of the circuit is seen in Figure 21.39. (a) What is the time constant if…
ChecagemWhen is the potential difference across a capacitor an emf?