Overview
1. A 42 Ω resistor and a 20 Ω resistor are connected in parallel, and the combination is connected across a 240 V dc line. (a) What is the resistance of the parallel combination? (b) What is the total current through the parallel combination? (c) What is the current through each resistor?
2. Write the three loop equations for the loops shown. (Use Kirchhoff's Rules)
[Image unavailable: Circuit problem for loop rule.]
3. Find the emfs 𝜀1 and 𝜀2 in the circuit. (Use Kirchhoff's Rules)
[Image unavailable: Circuit problem for Kirchhoff.]
4. The circuit has been in position b for a long time (capacitor not connected to battery). The switch is thrown from b to a at time t = 0 s (capacitor connected to battery).
Vb = 12 V, C = 10 𝜇F, R = 20 Ω
[Image unavailable: RC Circuit Example.]
a) What is the current through the resistor just before the switch is thrown?
b) What is the current through the resistor just after the switch is thrown?
c) What is the charge on the capacitor just before the switch is thrown?
d) What is the charge on the capacitor just after the switch is thrown?
e) What is the charge on the capacitor at time t = 0.3 msec after the switch is thrown?