1. Mr. Bahaa Abou Harfoush Correction of the quiz + - L1L1 L2L2 L3L3 A1A1 com A2A2 A3A3 K a) On the figure b) A 1 +ve (connected correctly) A 2 & A 3 - ve (not connected correctly) ( Law of uniqueness of voltages ) Upper and lower branches are connected in parallel, then ( Law of uniqueness of voltages ) Since L 1 and L 2 are identical, then First case: the switch K is closed.

2. Mr. Bahaa Abou Harfoush d) yes, since the middle and lower branches are connected in parallel. OR middle and lower branched have different currents. e) The burnt lamp ( L 2 ) acts as an open switch, and since the two lamps are connected in series, then L 3 will not shine. L 1 will remain glowing, since the middle and lower branches are connected in parallel. f) g)Law of addition of current

3. Mr. Bahaa Abou Harfoush Second case: the switch is opened. Law of addition of current b) The voltage across an open switch is equal to the voltage across the generator. c) d) Voltmeter.