## Question

###### 2:17 p. m. @ 132% Listo Online_Lab_on_Circuits_with_... ☺ Lab #5 : Circuits with Resistors and Capacitors...

2:17 p. m. @ 132% Listo Online_Lab_on_Circuits_with_... ☺ Lab #5 : Circuits with Resistors and Capacitors Name: I. Simple circuits with resistors Imagine that you are given three resistors, each with a value R-300 Ohms and a DC power supply a battery) of 12 V. NOTE: In a normal lab you will be required not only to make the calculations but also to wire the circuits on a breadboard, measure the currents and compare your measurements with your predicted values of the currents. In the expraordinary quarantine situation associated with COVID-19 that part is dropped out. Just calculate the circuits, embed the pictures of the circuits in the spaces provided and upload your lab on Moodle in the designated Drop Box. 1. How would you connect these resistors if you would like to draw the largest current from the battery? What is the value of this current? Calculate the total power delivered by the battery to the circuit as well as the power dissipated to heat in each resistor. Draw a schematic of the circuit below and do the calculations to back upi your statements. 2. How would you connect these resistors if you would like to draw the smallest current from the battery? What is the value of this current? Calculate the total power delivered by the battery to the circuit as well as the power dissipated to heat in cach resistor. Draw a schematic of the circuit below and do the calculations to back upi your statements.

2:17 p. m. 1 32% Listo Online_Lab_on_Circuits_with_... U 3. How would you connect these resistors to the battery if you wanted the largest current (the one yoint through the battery) to pass through one of the resistors and split in equal parts through the other two resistors. Draw a schematic circuit and calculate the total power dissipated as well as the power dissipated at reach resistor. 4. How would you connect these resistors if you wanted the largest current (the one through the battery) to split in ratio 2:1 as it goes through the rest if the resistors. Draw a schematic circuit and calculate the total power dissipated as well as the power dissipated at each resistor in this case. II. Transient processes in RC Circuits We discussed in our lectures the processes of charging (left figure)

2:17 p. m. 1 32% Listo Online_Lab_on_Circuits_with_... ☺ II. Transient processes in RC Circuits We discussed in our lectures the processes of charging (left figure) and discharging (right figure) of a capacitor through a resistor The graph shows how the charge at the plate of the capaciti decreases with time during the dicharge of the capacitor. The time it takes for cpacitor to discarge to a fraction of e=0.3678 of its original (fully charged) value is called time constant and it is equa to the product of the restance and the Capacitance, i.e. -RC. Calculate -RC, for a circuit of R-5kOhms and C-12nF. _seconds TS Observe and measure the time constant using an Oscilloscope. Not required in COVID-19 emergency situation. Signal below is the input (rectangular, or TTL) signal of the RC circuit. You may think that the input signal consists of periods of Charging (+5V) an Discharging (OV) feeds to the capacitur through the resistor. The signal above displays the response of the RC circuit. Notice that the rising exponential is correlated with Charging and the falling off exponential is correlated with the process of Discharg of the Capacitor.

2:17 p. m. 1 32% Listo Online_Lab_on_Circuits_with_... ☺ The graph shows how the charge at the plate of the capaciti decreases with time during the dicharge of the capacitor. The time it takes for cpacitor to discarge to a fraction of el= 0.3678 of its original (fully charged) value is called time constant and it is equa to the product of the restance and the Capacitance, i.e. =RC. Calculate =RC, for a circuit of R=5kOhms and C=12nF. T- _seconds Observe and measure the time constant using an Oscilloscope. Not required in COVID-19 emergency situation. Signal below is the input (rectangular, or TTL) signal of the RC circuit. You may think that the input signal consists of periods of Charging (+5V) an Discharging (O V) feeds to the capacitur through the resistor. The signal above displays the response of the RC circuit. Notice that the rising exponential is correlated with Charging and the falling off exponential is correlated with the process of Discharg of the Capacitor. Q-CAI-- -Q(1-2 Q-C

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