The current supplied to an air conditioner unit is 4.00 amps. The air conditioner is wired using a 10-gauge (diameter 2.588 mm) wire. The charge density is n = 8.48 × 10 28 electrons/m3. Find the magnitude of the current density. Negative charge of an electron = 1.609 × 10 −19 C 12.2 × 10^5 A/m^2 8.6 × 10^5 A/m^2 7.6 × 10^5 A/m^2 9.2 × 10^5 A/m^2
An aluminum wire 1.628 mm in diameter (14-gauge) carries a current of 3.00 amps. What is the absolute value of the charge density in the wire? The density of aluminum is 2.70 g/cm3. The molar mass of aluminum is 26.98 g/mol. Assume each atom of metal contributes one free electron. 4.03 × 10^28 electrons/m^3 5.03 × 10^28 electrons/m^3 2.03 × 10^28 electrons/m^3 6.03 × 10^28 electrons/m^3
An copper wire 1.628 mm in diameter (14-gauge) carries a current of 3.00 amps. What is the absolute value of the charge density in the wire? The density of copper is 8.96 g/cm3. The molar mass of copper is 63.5 g/mol. Assume each atom of metal contributes one free electron. 5.48 × 10^28 electrons/m^3 9.58 × 10^28 electrons/m^3 6.48 × 10^28 electrons/m^3 8.48 × 10^28 electrons/m^3
How many electrons flow through a point in a wire in 3.00 s if there is a constant current of I = 4.00 A? Negative charge of an electron = 1.609 × 10 −19 C 8.0 × 10^19 7.5 × 10^19 8.5 × 10^19 9.0 × 10^19
How many volts are supplied to operate an indicator light on a DVD player that has a resistance of 140 Ohm, given that 25.0 mA passes through it? 5.00 V 4.50 V 3.50 V 5.50 V
Calculate the effective resistance of a pocket calculator that has a 1.35-V battery and through which 0.200 mA flows. 6.750 k Ohm 4.750 k Ohm 5.750 k Ohm 5.650 k Ohm
What is the resistance of a 20.0-m-long piece of 12-gauge copper wire having a 2.053-mm diameter? 0.10 Ohm 0.25 Ohm 0.30 Ohm 0.40 Ohm
What is the maximum voltage that can be applied to a 20-kΩ resistor rated at 1/4 W? 50.0 V 70.7 V 90.5 V 100.0 V
Digital medical thermometers determine temperature by measuring the resistance of a semiconductor device called a thermistor (which has a = -0.06/∘C) when it is at the same temperature as the patient. What is a patient's temperature if the thermistor's resistance at that temperature is 82.0% of its value at 37∘C (normal body temperature)? 60 celsius 80 celsius 40 celsius 50 celsius
A person hits a tennis ball with a mass of 0.058 kg against a wall. The average component of the ball's velocity perpendicular to the wall is 11 m/s, and the ball hits the wall every 2.1 s on average, rebounding with the opposite perpendicular velocity component. What is the average force exerted on the wall? 0.55 N 0.48 N 0.33 N 0.61 N