Problem 6: (II) A 12-V battery causes a current of 0.60 A through a resistor. (a) What is its resistance, and (b) how many joules of energy does the battery lose in a minute?
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- Consider a power plant is located 60 km away from a residential area uses Q-gauge (A=42.40mm2) wire ofcopper to transmit power at a current of I = 100.00 A.How much more power is dissipated in the copper wires than it would be in superconducting wires?Resistors are commonly rated at 18W,14W,12W ,1 W and 2 W for use in electrical circuits. If a current of1 = 2.00 A is accidentally passed through a R=1.00 resistor rated at 1 W, what would be the most probable outcome? Is there anything that can be done to prevent such an accident?How does the resistance for copper and for silicon change with temperature? Why are the behaviors of these two materials different?
- Residential building codes typically require the use of 12-gauge copper wire (diameter 0.205 cm) for wiring receptacles. Such circuits carry currents as large as 20.0 A. If a wire of smaller diameter (with a higher gauge number) carried that much current, the wire could rise to a high temperature and cause a fire. (a) Calculate the rate at which internal energy is produced in 1.00 m of 12-gauge copper wire carrying 20.0 A. (b) Repeat the calculation for a 12-gauge aluminum wire. (c) Explain whether a 12-gauge aluminum wire would be as safe as a copper wire.Integrated Concepts A 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of 10.0 A. (a) What is the battery’s internal resistance? (b) What power is dissipated inside the battery? (c) At what rate (in °C/min ) will its temperature increase if its mass is 20.0 kg and it has a specific heat of 0.300 kcal/kg. °C, assuming no heat escapes?A 0.50-W, 220- resistor carries the maximumcurrent possible without damaging the resistor. If the current were reduced to half the value, what would be the power consumed?
- Check Your Understanding How would you use a river and two waterfalls to model a parallel configuration of two resistors? How does this analogy break down?An electronic device designed to operate at any temperature in the range from 10.0C to 55.0C contains pure carbon resistors. By what factor does their resistance increase over this range?If you have five (5) 100-k2 resistors, how will you be able to get a total of a) 25 kQ b) 50 kQ c) 150 kQ? Combine only the needed number of resistors.
- It is desired to build a copper wire of mass density Pm m=1 g. If the wire should have a resistance R=0.5 Q 1) What should be the length of the copper wire? II) What must be the radius of the cross section of the copper wire? = 8.92- Cm3' resistivity p = 1.7x10-8 Ωm mass1) so that the current varies by less than 10% as the load resistance (R) changes from 200 to 500N. The current must be at least 1.5 mA. For V = 10 Volts, find a resistance R which will meet these criteria. You want to make a current source from a battery (V) and resistor (R) R I V- RLFour AA batteries of -1.5 V in series are used to give power to a transistor radio. If the batteries can provide a full charge of 240 C, how long will they last if the radio has a resistance of R=200 22?