Physics!! Consider the circuit shown below. Your power supply has a voltage of 1
ID: 2133601 • Letter: P
Question
Physics!!
Consider the circuit shown below. Your power supply has a voltage of 1.8 V. You want the current in the ammeter A to be 50.6 mA. The resistor R3 is a potentiometer that is a variable resistor that can be changed from 0 to 200 Ohm. In addition to the potentiometer you have one of each of the following resistors available of values 22 Ohm and 1000 Ohm (one of each). Which resistors) will have to be used for R:? More than one answer may be correct. The 1000 Ohm resistor will work, but we would need to substantially increase the voltage of the power supply higher than 1.8 V. Only the 22 Ohm resistor will work for 1.8 V. Only the 1000 Ohm resistor will work for 1.8 V. Neither the 22 or 1000 1i resistor will work for 1.8 V. Either the 22 or 1000 12 resistors will work for 1.8 V. What value does the resistor R, have to be according to your answer in a)? Ohm What value does the resistor R, have to be according to your answer in a)? Ohm Place the 22 and 1000 Ohm resistors in the positions for R1 and R2 in accordance with your answers above. What value will the resistor R3. have to be for you to obtain 50.6 mA in the ammeter?Explanation / Answer
I = V /(R1 + R2*R3/(R2+R3) )*R2/(R2+R3) = V*R2/(R1R2+R2R3+R1R3)
hence V /I = (R1R2+R2R3+R1R3)/R2 = 35.57 ohm = R1R3/R2 + R1+R3
therefore R1 cant be 1000 ohms unless the voltage is increased substantially.
but 22 ohm can work .
hence for part a) answer are a and b
b) R1 =22 ohm
c) R2 =1000ohm
d) solving above eqn R3 = 13.28 ohm