A Nichrome heater dissipates 517 W when the applied potential difference is 110 V and the wire temperature is 800°C. What would be the dissipation rate if the wire temperature were held at 202°C by immersing the wire in a bath of cooling oil? The applied potential difference remains the same, and a for Nichrome at 800°C is 4.0 × 104 K1 Number i Units eTexthook and M.
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- la. This resistor has a resistance of 48002, and 32mA of current flows to the left into it. The right end of the resistor is at a potential of VR= 12.5V. What is the potential difference AV across the resistor? 1b. What is the potential VL of the left end of the resistor? 1c. What is the power output by the resistor? VLP 1d. What is the current that flows out of the resistor? resistor R=4800 I I= 32mA VR=12.5VA large capacitor of 1000 µF is charged by a steady current of 1 mA until it reaches a voltage of 100 V. At that voltage, the charging circuit is disconnected. a) Calculate how long the charging takes. A 10 k2 resistor is connected across the capacitor to discharge it. Sketch a graph of the current I in the resistor as a function of time, with appropriate numbers and units marked on the axes. b)If all of the resistors are 4.7 k, what is the value of RT?
- The ideal battery in Figure (a) has emf 8-6.2 V. Plot 1 in Figure (b) gives the electric potential difference V that can appear across resistor 1 of the circuit versus the current i in that resistor. The scale of the Vaxis is set by V, 18.9 V, and the scale of the i axis is set by i, 3.21 mA. Plots 2 and 3 are similar plots for resistors 2 and 3, respectively. What is the current in resistor 2? 64 Number (a) Units *(mA) (8)The resistance of the skin on a person's finger is typically about 37,000 N. How much voltage would be needed to cause a current of 0.001 A to flow into the finger? (This is about enough current to just be felt by most people.) VThree resistors are made out of three different materials and have different (but uniform) cross sections. Resistor 1 has a circular cross section of radius 1.18 mm . Resistor 2 has a square cross section with a side length of 4.77 mm . The third resistor's cross section is a right triangle with two sides of length 1.62 mm . All of the resistors are 0.913 cm in length. Use the provided table of resistivities to calculate the resistance of each resistor. material 1 0.00367 material 2 0.488 material 3 4.63 x 10^-5
- Flying Circus of Physics Kiting during a storm. The legend that Benjamin Franklin flew a kite as a storm approached is only a legend – he was neither stupid nor suicidal. Suppose a kite string of radius 2.16 mm extends directly upward by 0.801 km and is coated with a 0.508 mm layer of water having resistivity 182 Q-m. If the potential difference between the two ends of the string is 192 MV, what is the current through the water layer? The danger is not this current but the chance that the string draws a lightning strike, which can have a current as large as 500 000 A (way beyond just being lethal). Number i UnitsBefore a load is applied, the terminal (total) voltage of a power supply is measured to be 40 V. When a load of 500 Q is attached the voltage across the load is measured to be 36 V. Determine the following.. 40 V R E 500 N 36 V (no load) a. The current when the load is a applied: b. The internal resistance of the power supply ΩThere's a good chance you're completing this HW on a laptop. A typical laptop uses about 15 W of power provided by a battery operating at 11.5 V. Under such conditions, 10 hrs is a typical lifetime of the battery. What is the current delivered by the battery to the laptop in amps? Give your answer to 3 significant digits.
- Part a and bA platinum resistance thermometer (PRT) is a transducer which measures temperature 0 by means of consequent change of electrical resistance RT between its two terminals. Such a PRT has the following quadratic characteristic: RT=Ro [1+A0+BO^2] The PRT is calibrated so that its resistance is Ro = 100 Q at a reference temperature of 0 = 0°C. The coefficients have the following values: A = +4.0 x 10-3 °C-1 B = -5.0 x 10-6 oc-2 Determine sensitivity of this transducer at temperatures of +50 °C. Select one: O a. 0.45 Q/°C Ob. -0.45 Q/°C -0.35 Ω/ΟC d. 0.4 0/°C O e. 0.35 Q/°C O f. -0.4 0/PCE. A water heater that is connected across the terminals of a 15.0 V power supply is able to heat 250 ml of water from room temperature of 25°C to boiling point in 45.0 secs. What is the resistance of the heater? The density of water is 1,000 kg/m2 and the specific heat capacity of water is 4,200 J/kg/°C.