If a 30 V potential difference causes a 0.60 A current to flow through a resisto
ID: 1534332 • Letter: I
Question
If a 30 V potential difference causes a 0.60 A current to flow through a resistor, its resistance is 32 Ohm 18 Ohm 18 Ohm 50 Ohm 15 Ohm A parallel plate capacitor has plates of area 0.50 m^2 separated by distance of 2.0 mm. What is this capacitors capacitance? 250 F 4.4 = 10 - 10 F 50 F 4.6 = 10 - 10 F 2.2 = 10^9 F A 24-kw electric furniture is connected a 240 v kina. What is the resistance of the farruca? 0.42 ohm 1000 ohm 10 ohm 2.4 ohm 100 ohm A carbon resistor has a resistance of 18 ohm at a temperature of 20 degree C. What is its resistance at a temperature of 120 degree C? (The temperature coefficient of resistivity for carbon is -5.0 = 10^-4/C degree.) 15 ohm 14 ohm 17 ohm 16 ohm 18 ohm What is the voltage across a 5.0 ohm resistor if the current through it is 5.0 A? The magnitude of the charge on each plate of a parallel plate capacitor is 4 mu C and the potential difference between the plate is 80 V. What is the capacitance of this capacitor? 100 times 10^-6 F 0.1 times 10^-6 F 300 times 10^-6 F 5 times 10^-8 F 20 times 10^-6 F Two-point charge of +50.0 mu C and -11.0 mu C are separated by a distance of 20.0 cm. A +7.00 mu C charge is placed midway between these two charge. What is the electric force acting on this charge because of the other two charges? 3.84 N directed towards the negative charge 3.84 N directed towards the positive charge 384 N directed towards the negative charge 384 N directed towards the positive charge 0.453 N directed towards the negative charge How much charge must pass by a point in 1.5 s for the current to be 2.0 A? 1.3 C 4.3 C 3.0 C 0.75 C A charge of 12 C passes through an electroplating apparatus in 2.0 min. What is the average current? 1.0 A 0.60 A 0.24 A 6.0 A 0.10 A
Explanation / Answer
1) R = V/I = 3 / 0.6 = 5 ohm
2) C = Aeo/d
= 0.5*8.85*10^-12 / 2*10^-3
= 2.2125*10^-9 C
3) P = V^2 / R
24000 = 240^2 / R
R = 2.4 ohm
4) 2 = 9*10^9*q^2 / 1.5^2
q = 2.23*10^-5 C =22.4 uC