A coil of copper wire (p = 10.370-CM/ ft) has a length of 600 ft. What is the length of an aluminum conductor (p =17 Q-CM/ft), if its cross-sectional area and resistance are the same as those of the copper coil.
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- The copper windings of a motor have a resistance of 46 Ω at 20oC when the motor is idle. After the motor has run for several hours, the resistance rises to 59 Ω. What is the temperature in Celsius of the windings now? Ignore changes in the dimensions of the windings. The temperature coefficient of resistivity for copper is 4.3 × 10-3 K-1.The space between two metallic coaxial cylinders of length L = 0.520 m and radii a = 1.70 cm and b = 2.50 cm is completely filled with a material having a resistivity ρ = 34.0 Ω⋅m. The figure below shows a cross section of the configuration. What is the resistance between the two cylinders? Give your answer with a unit of "Ohm". Find the current between the two cylinders if a potential difference of 16.0 Volts is maintained between the two cylinders.A person in bare feet is standing under a tree during a thunderstorm, seeking shelter from the rain. A lightning strike hits the tree. A burst of current lasting 30.0 μs passes through the ground; during this time the potential difference between his feet is 40.4 kV. If the resistance between one foot and the other is 504 Ω, what is the current through his body? f the resistance between one foot and the other is 504 Ω, how much energy is dissipated in his body by the lightning?
- Problem 27.59 The total amount of charge that has entered a wire at time t is given by the expression Q=(20 C)(1-e-t/(2.0)), where t is in seconds and t≥ 0. 3 D C 4 998 R F 5 V ED G 6 B T Part A Find an expression for the current in the wire at time t. Assume the numeric values in your entry are in SI units. Express your answer in terms of t. [VG| ΑΣΦ Y I(t) = Part B Submit Previous Answers Request Answer (10A)e X Incorrect; Try Again; 2 attempts remaining Submit What is the maximum value of the current? Express your answer with the appropriate units. Imax 10 A ✓ Correct MacBook Air H & 7 1 2s Previous Answers N 44 12 Ĉ C WC 8 L M 9 K O ? O ( P F33 + ? AA 15 of 16 > F12 Review }A solar cell generates a potential difference of 0.17 V when a 550 resistor is connected across it, and a potential difference of 0.24 V when a 970 resistor is substituted. What are the (a) internal resistance and (b) emf of the solar cell? (c) The area of the cell is 1.2 cm² and the rate per unit area at which it receives energy from light is 4.9 mW/cm². What is the efficiency of the cell for converting light energy to thermal energy in the 970 2 external resistor? (a) Number (b) Number (c) Number i Units Units Units Ω V perA coil consists of 290 windings (loops, or "turns") of insulated copper wire, where the insulator thickness can be ignored. The wire diameter is 1.6 mm. The coil radius is 13 cm (and you should assume that all the wire is at this radial distance). What is the resistance of this coil?
- A gold wire carries 15.6 A of current with a drift velocity of 3.7 × 10-3 m/s. Assume there is one free electron per gold atom, and the density of gold is 1.93 × 104 kg/m3. The molecular weight of gold is 196.97 g/mol. Part (a) What is the diameter of this gold wire? Part (b) For the problem above, determine the resistance of the wire under those conditions. Assume the wire is 4.2 m in length, and the resistivity of gold is 2.44 × 10-8 Ω⋅m. Part (c) How much power is dissipated by this wire? (In watts) Part (d) If the wire is heated by an additional 189 K (compared to part (a)), what is the new resistance at this raised temperature? The temperature coefficient of resistivity for gold is 3.4 × 10-3 °C-1 Part (e) Under the conditions in part (d), what is the value of the potential for the wire? Part (f) Under the conditions in part (d), how many electrons pass through the wire in 11 s?Calculate the drift velocity (in m/s) of electrons in a 6 gauge copper wire (which has a diameter of 4.115 mm) carrying a 22.9 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103 kg/m³. (Indicate the direction with the sign of your answer.) m/sA person grasps the ends of an electrically conducting copper wire in each hand. The wire has a cross-sectional area of 4.0x106 m² and its surface is not insulated. If the person's hands are wet, the resistance of the possible electrical pathway from one hand, up the arm, across the chest and down into the other hand is about 1 kQ. (a) A current of 10 mA can “freeze" the muscles so the hands are clenched around the wires. Estimate the potential difference between the ends of the wire which would cause this. (b) How much power is dissipated in the person's body if this current flows? (c) The ends of the wire are connected to make a circuit that includes a battery, If the person grasps the wire with hands 0.20 m apart, comment on the resistances of the possible paths of electric current. The resistivity of copper is 1.7×108 Qm.
- Consider a wire made of copper with conductivity 6.0 × 107 £¯¹m³¹, which has a circular cross-section of radius 0.56 mm. In a particular circuit, this wire carries a current of 4.5 A. What is the electric field, in volts per meter, inside this wire? If we replace this wire with a gold one of the same size, with conductivity 4.1 × 107 ¹m-¹, what will the electric field in the wire be?Hi, I have a question regarding electromagnetism. The question is as follows: An aluminum rod has a resistance of 1.590 Ω at 20.0°C. Calculate the resistance of the rod at 102°C by accounting for the changes in both the resistivity and the dimensions of the rod. The coefficient of linear expansion for aluminum is 24.0 ✕ 10-6 (°C)−1.Q.6: Given R1=15N, R2=102, R3=222 and R4=152, find the current flowing through resistance R4. R2 R1 T 8.0V Ra R3 Vo S 12.0V V = k U = k. n.n qi9 j Liki rij Ceg = YN Gi - N 1