The rms current in a copy machine is 5.84 A, and the resistance of the machine is 18.2Ω. What are  (a) the average power and  (b) the peak power delivered to the machine?

Consider a series RC circuit as in the figure below for which R = + E R (a) Find the time constant of the circuit. S 6.50 MQ, C = 6.70 μF, and E = 25.5 V. (b) Find the maximum charge on the capacitor after the switch is thrown closed. μC (c) Find the current in the resistor 10.0 s after the switch is closed. μA

A fully charged RC circuit is set up using R = 15.0 Ω and C = 8.20 μF with the switch initially open, as shown in the figure. At a certain time after the switch is closed, the current in the circuit has magnitude 3.00 A and the charge on the capacitor is 30.0 μC. At this time, what is the rate at which energy is being stored in the capacitor (in W)?

The values of the components in a simple series RC circuit containing a switch (see figure below) are C = 1.00 µF, R = 2.00  106 Ω, and  = 10.0 V. At the instant 11.2 s after the switch is closed, calculate the following.(a) the charge on the capacitorq =  µC(b) the current in the resistorI =  nA(c) the rate at which energy is being stored in the capacitorrate =  nW(d) the rate at which energy is being delivered by the batteryPbattery =  nW

An ECG monitor must have an RC time constant less than 1.00 × 102 μs so it can measure variations in voltage over small time intervals. If the resistance of the circuit (due mostly to that of the patient’s chest) is 0.85 kΩ, what is the maximum capacitance of the circuit in F?

A R = 707 Ω resistor, an uncharged C = 185 μF capacitor, and a ε = 6.26 V emf are connected in series. Part (a) What is the initial current in amps? Part (b) What is the RC time constant in seconds? Part (c) What is the current after one time constant in amps? Part (d) What is the voltage on the capacitor after one time constant in volts?

(a) What is the cost of heating a hot tub containing 1510 kg of water from 10.0°C to 40.0°C, assuming 75.0% efficiency to take heat loss to surroundings into account? The cost of electricity is 9.00¢/(kW • h) and the specific heat for water is 4184 J/(kg · °C). $ (b) What current was used by the 220 V AC electric heater, if this took 4.95 h? Additional Materials O Reading

(a) What is the resistance of a lightbulb that uses an average power of 25.0 W when connected to a 60.0-Hz power source having a maximum voltage of 170 V? Ω (b) What is the resistance of a 75.0-W lightbulb? (Assume the lightbulb uses an average power of 75.0 W when connected to a power source having a maximum voltage of 170 V.) Ω

Consider a series RC circuit as in the figure below for which R = 9.00 MQ, C = 7.00 µF, and E = 32.0 V. S + E R www (a) Find the time constant of the circuit. S (b) What is the maximum charge on the capacitor after the switch is thrown closed? μC (c) Find the current in the resistor 10.0 s after the switch is closed. HA