Two straight wire-electrodes are placed, in parallel, across your index finger a distance 2.2 cm apart. The terminals of a battery, with a voltage of 9.8 V, are attached, one to each electrode. If an ammeter in series with the electrodes displays a current of 0.71 μA, what is the resistance of your skin in units of MQ? Your Answer: Answer units
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- Resistance depends on the size and shape of a conductor. We expect a long wire to have higher resistance than a short one (everything else being the same) and a thicker wire to have a lower resistance than a thin one. Resistance also depends on the intrinsic property of the conductor called the resistivity. If the resistivity of a particular wire is 70.26x10-8 Ω ⋅ m, the wire is 44.47mm in length, and the radius of the diameter of the wire is 1.95m, what is the resistance of the wire in units of Ohms (Ω)?The resistivity of aluminum is 2.82 X 10* -8 Ω. m. HINT (a) Find the resistance of an aluminum wire (in ohms) with a radius of 1.28 mm and a length of 1.03 m. (b) Calculate the volume (in m) of aluminum in the wire. m3 (c) Suppose that volume of aluminum is formed into a new wire with a length of 2.32 m. Find the new resistance of the wire (in ohms).A copper wire has a resistance of 15 Ω at some temperature. An aluminum wire has 3 times the length and 5 times the radius of the copper wire. The resistivity of copper is 0.7 times that of aluminum. What is the resistance, in Ω, of the aluminum wire at the same temperature? Round your answer to 0 decimal places.
- You have a simple circuit consisting of a battery and a lightbulb (you can imagine that this circuit is contained within a flashlight). If the total potential difference provided by the batteries in this circuit is 6V, and if you measure the current to be 17.08mA, what is the resistance of the light bulb (created by the thin wire which composes the filament) in units of Ohms?Suppose you're using a copper wire that has a radius of 0.5 mm, is 3.8 m long, and has a resistivity p=1.7 x 10 8 N- m. What is the resistance of the wire in Ohms?You have a simple circuit consisting of a battery and a lightbulb (you can imagine that this circuit is contained within a flashlight). If the total potential difference provided by the batteries in this circuit is 6V, and if you measure the current to be 23.04mA, what is the resistance of the light bulb (created by the thin wire which composes the filament) in units of Ohms?
- When resistors 1 and 2 are connected in series, the equivalent resistance is 17.1 Q. When they are connected in parallel, the equivalent resistance is 2.93 Q. What are (a) the smaller resistance and (b) the larger resistance of these two resistors? (a) Number i Units (b) Number i UnitsSuppose that the potential difference across the membrane of a biological cell is 57 mV, and that the resistance across the membrane is 7.8 × 109 Ω. The difference in potential drives a current of Na+ ions across the membrane of the cell. How many ions flow in 0.6s? (hint: calculate the electric current, then the total charge, then the number of ions.)A person notices a mild shock if the current along a path through the thumb and index finger exceeds 88 µA. Compare the maximum possible voltage without shock across the thumb and index finger with a dry-skin resistance of 3.8 x 10° Q and a wet-skin resistance of 1,900 2. dry skin V wet skin V