In the figure below, a nichrome metal cylinder is connected to a 90 V battery. The nichrome cylinder is 0.7 m long and has a cross-sectional area of 3e-6 m2 . At 0 ̊C, nichrome has a resistivity of 1.00e-6 Ω-m, and nichrome has a temperature coefficient of 0.4e-3 ( ̊C)-1 .
What is the current in the circuit when the nichrome cylinder is at 0 ̊C?
In the figure below, a nichrome metal cylinder is connected to a 90 V battery. The...
A wire 2.60 m long with a cross-sectional area of 7.07x10-6 m2 is connected to a 30.0 V power supply. If a current of 12.0 A is measured in the wire, a) what is the resistivity of the wire in ohm-meters? Answer in scientific notation. b) If this resistivity had been measured at 20.0 °C, what temperature, in Celsius, would we need to heat/cool the wire to for the resistance to be 4.25 Ω if the temperature coefficient of resistivity...
A thick copper wire 2.3 m long is connected in series to a thin high-resistance Nichrome wire. In the steady state, the conventional current in the thick copper wire is 4 amperes. In this copper wire there are 8 � 1028 mobile electrons per cubic meter and the electron mobility is 4.5 � 10?3 (m/s)/(V/m). The cross-sectional area of the copper wire is 6 � 10?7 m2. The thin high-resistance Nichrome wire (which is connected in series to the thick...
A Nichrome heating element that has resistance 28.0 Ω is connected to a battery that has emf 86.0 V and internal resistance 1.6 Ω . An aluminum cup with mass 0.130 kg contains 0.200 kg of water. The heating element is placed in the water and the electrical energy dissipated in the resistance of the heating element all goes into the cup and water. The element itself has very small mass. How much time does it take for the temperature...
A Nichrome heating element that has resistance 27.0 Ω is connected to a battery that has emf 88.0 V and internal resistance 1.6 Ω . An aluminum cup with mass 0.130 kg contains 0.200 kg of water. The heating element is placed in the water and the electrical energy dissipated in the resistance of the heating element all goes into the cup and water. The element itself has very small mass. How much time does it take for the temperature...
A particular wire has a resistivity of 2.1*10^-8 Ω · m and a cross-sectional area of 2.9*10^-6 m2. A length of this wire is to be used as a resistor that will receive 41 W of power when connected across a 20-V battery. What length of wire is required? _________km
2) Figure 2 illustrates a composite object comprising first and second solid cylindrical conductors connected end to end. The first cylinder has length LI, uniform x-sectional area Aı, and uniform resistivity pi. The 2nd cylinder has length L2, uniform x-sectional area A2, and uniform resistivity p2. The terminals of an ideal L. P Figure 2 A, A, battery having emf E are connected to the opposing ends of the object. Determine expressions for the following quantities {Li, Ai, a) the...
2, (A) Sketch a circuit with a 10 V battery connected across a 20 Ω resistor. (B) Indicate the positive and negative poles of the battery. (C) Indicate the direction of positive current flow 3. How much current flows through your resistor in question (2)? 4. A certain wire has a resistance of 10 Q. (A) What is the resistance if twice as much length of wire is used instead? (B) What is the resistance if two such 10 Ω...
A cylinder is closed by a piston connected to a spring of constant 2.20 x 10' N/m. With the spring relaxed, the cylinder is filled with 5.00 L of gas at a pressure of 1.00 atm and a temperature of 20.0°C. (a) If the piston has a cross-sectional area of 0.0140 m- and negligible mass, how high will it rise when the temperature is raised to 250°C? (b) What is the pressure of the gas at 250°C?
Now let’s see how temperature affects the resistance of copper wire. A length of 18 gauge copper wire with a diameter of 1.02 mm and a cross-sectional area of 8.20×10−7 m2 has a resistance of 1.02 Ω at a temperature of 20 ∘C. Find the resistance at 0 ∘C and at 100 ∘C. The temperature coefficient of resistivity of copper is 0.0039 (C∘)−1. On a hot summer day in Death Valley, the resistance is 1.15 Ω. What is the temperature?