2002B3 Two lightbulbs, one rated 30 W at 120 V and another rated 40 W at 120 V , are arranged in two different circuits.
a. The two bulbs are first connected in parallel to a 120 V source.
i. Determine the resistance of the bulb rated 30 W and the current in it when it is connected in this circuit.
ii. Determine the resistance of the bulb rated 40 W and the current in it when it is connected in this circuit.
b. The bulbs are now connected in series with each other and a 120 V source.
i. Determine the resistance of the bulb rated 30 W and the current in it when it is connected in this circuit.
ii. Determine the resistance of the bulb rated 40 W and the current in it when it is connected in this circuit.
c. In the spaces below, number the bulbs in each situation described, in order of their brightness.
( 1= brightest, 4= dimmest)
\_\_\_ 30 W bulb in the parallel circuit
\_\_\_ 40 W bulb in the parallel circuit
\_\_\_ 30 W bulb in the series circuit
\_\_\_ 40 W bulb in the series circuit
d. Calculate the total power dissipated by the two bulbs in each of the following cases.
i. The parallel circuit
ii. The series circuit