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- You plotted a graph of current vs. voltage and found the slope of the best fit line is m± Am = 4.69 ± 1.79 Amps/Volt. The resistance can be calculated from the slope by knowing: R = 1 m The fractional uncertainty in the slope is equivalent to the fractional uncertainty in the resistance: AR R = Am m Calculate the uncertainty in the resistance, AR in units of (ohms), then enter the raw value (no units) into the box below. Round to two decimal places. AR=During an experiment to verify Ohm's law, the current and resistance of a circuit are measured. [Resistance is measured in Ohm () and current in Ampere (A)]. www R +, Battery The measured value of the current is I 3±0.1 A and that of the resistance is R = 17+0.3 . The voltage applied (in Volts) can be calculated using the formula, V = IR. Calculate the, a) Voltage applied in the circuit (in Volts) = b) Fractional uncertainty in the voltage = c) Absolute uncertainty (in Volts) in the voltage =The voltage V (volts), current I (amperes), andresistance R (ohms) of an electric circuitare related by the equation V = IR. Suppose that V is increasing atthe rate of 1 volt/sec while I is decreasing at the rate of 1/3 amp/sec. Let t denote time in seconds. What equation relates dR/dt to dV/dt and dI/dt?
- sq 4. Maximum surface resistance. Consider a square sheet of side L, thickness d, and electrical resistivity p. The resistance measured between opposite edges of the sheet is called the surface resistance: R = pL/ Ld = p/d, which is independent of the area of the sheet. (R is called the resistance per square and is expected in ohms per square, because p/d has the dimensions of ohms.) If we express p by p=m/ne²t, then Rq=m/ndet. Suppose now that the minimum value of the collision time is determined by scattering from surfaces of the sheet, so that Td/v, where v is the Fermi velocity. Thus the maximum surface resistivity is Rmvp/nd²e². Show for a monatomic metal sheet one atom thickness that sq Rħ/e² = 4.1k, where lkn is 10³ ohms. sqassume that the voltage of the current is given by V = 170 sin (120πt), where t is in seconds. Find thewattage ratingmaximum wattageV2of each electric device ifthe current flowing through the device is I amps.A quarterback throws a ball with an initial velocity of v, feet per second at an angle 0 with the horizontal. The horizontal distance x in feet that the ball is thrown is modelled by a equation x=vo/16sin theta cos theta.for a fixed vo.find the angle that produces the maximum distance x.Question 1: By measuring the currents and times and then draw the current vs time graph using the measurement at the lab for ɛ =8 V, R=1M Q and C=1µF. What is the current at t=2.5 s? (20p) e RC = Ioe¯RC %3| R values obtained after the experiment: Io-8µA Approximate time until current becomes zero= 5.7 s
- The voltage V (volts), current I (amperes), andresistance R (ohms) of an electric circuitare related by the equation V = IR. Suppose that V is increasing atthe rate of 1 volt/sec while I is decreasing at the rate of 1/3 amp/sec. Let t denote time in seconds. What is the value of dI/dt?1.4. The resistance of a doped germanium crystal obeys the equation log R' = 4.697 – 3.917 log T. (a) In a liquid helium cryostat, the resistance is measured to be 218 N. What is the temperature? (b) Make a log-log graph of R' against T from 200 to 30,000 N. Th nocictance of a nlatinum wire is found to be 11.000 at the ice point, 15.247 N atBy measuring the currents and times and then draw the current vs time graph using the measurementat the lab for ε =8 V, R=1M Ω and C=1μF. What is the current at t=2.5 s? f values obtained after the experiment:I0=8μAApproximate time until current becomes zero= 5.7 s
- By measuring the currents and times and then draw the current vs time graph using the measurement at the lab for ε =8 V, R=1M Ω and C=60μF. What is the current at t=50 s?By measuring the currents and times and then draw the current vs time graph using the measurementat the lab for ε =8 V, R=1M Ω and C=4.7μF. What is the current at t=12 s? values obtained after the experiment:I0=8μAApproximate time until current becomes zero= 25 sDuring an experiment to verify Ohm's law, the voltage and resistance of a circuit are measured. [Resistance is measured in Ohm (2) and voltage in Volts (V)]. www R A +, + Battery The measured value of the voltage is V = 9.8 ± 0.4 V and that of the resistance is R = 15 ± 0.4 Q. The current through the circuit (in Ampere (A)) can be calculated using the formula, I =V/R. Calculate the, a) Current (in Ampere) = b) Fractional uncertainty in the current = C) Absolute uncertainty (in Ampere) in the surrent