Question

1. The duration of a photographic flash is related to an RC time constant, which is 0.103 μs for a certain camera. If the resistance of the flash lamp is 0.0364 Ω during discharge, what is the size of the capacitor, in microfarads, supplying its energy?

2. 1 2 1 Ra 2 2

Use the circuit above and Kirchhoff's Rules to determine the current through the R3 resistor. Assume the following details: E1 = 19.81 V, E2 = 44.64 V, r1 = 0.25, r2 = 0.4, R1 = 7.4, R2 = 2.2, R3 = 1.8. Be sure to give a positive value.

3. A 571 Ω resistor, an uncharged 1.58 μF capacitor, and a 5.13 V emf are connected in series. What is the initial current in milliamps?

4. A 594 Ω resistor, an uncharged 1.3 μF capacitor, and a 6.53 V emf are connected in series. What is the current in milliamps after one time constant?

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