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- (I) What voltage will produce 0.25 A of current through a 4800 Ωresistor?When an ion channel opens in a cell wall (see the attached problem), monovalent (charge e) ions flow through the channel at a rateof 1.0 x 107 ions/s.a. What is the current through the channel?b. The potential difference across the ion channel is 70 mV. What is the power dissipation in the channel?(I) What is the maximum voltage that can be applied acrossa 3.9-kΩ resistor rated at 1/4 watt?
- A 403 Ω resistor, an uncharged 102 μF capacitor, and a 4.01V emf are connected in series. The capacitor is initially uncharged. What is the current, in amperes, after one time constant has elapsed?A 120 V house circuit fused for 25 A has operating on it the following: two 75 W bulbs, a 1500 W heater, a 20 W radio, a1.5 W clock. (a) How large a current is required? (b)Will the fuse blow if a second electric heater rated at 1500 W is plugged into it?Suppose that E = 65 V. (Figure 1) What is the potential difference across the 40 Ω resistor? What is the potential difference across the 60 Ω resistor?
- Pacemakers designed for long-termuse commonly employ a lithium-iodine battery capable of supplying 0.42 A # h of charge. (a) How many coulombs of chargecan such a battery supply? (b) If the average current producedby the pacemaker is 5.6 mA, what is the expected lifetime of thedevice?A constant current transfers 10*10^14 electrons onto one plate of a capacitor in 3 minutes [min]. (a) What is the current, in units of amperes [A]? Express the answer using an appropriate SI prefix such that there are only 1, 2, or 3 digits shown to the left of the decimal. (b) If the capacitor has a capacitance of microfarads [F], what is the voltage in units of volts [V] across the capacitor?An automobile radio draws 800mAdc when operated from a 12V battery. What is the total resistance presented by the radio to the car battery?
- A 12-guage gold wire has a length of 1 meter. (a) What would be the length of a silver 12-gauge wire with the same resistance? (b) What are their respective resistances at the temperature of boiling water?(a) Of what material is a wire made, if it is 25.0 m long with a diameter of 0.100 mm and has a resistance of 77.7 at 20.0C ? (b) What is its resistance at 150.0C ?A cauterized, used to stop bleed in surgery, supplies 1.95 mA at 14 kV. Part (a) what is its power output, P, in watts? Part (b) what is the resistance, R, of the path, in megohms?