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20 14 the second model of mathematics in grade three is constant
Your painting is too rough. At least explain which of the left and right bulbs is L 1 L2. . .

Suppose the one on the left is L 1.

Then connect the left end of L 1 and the right end of L2 in parallel to meet the conditions of controlling two lamps, and connect the ammeter with L 1 in series to measure L 1.

The second line connects the left end of L2 and the left end of the power supply to form a loop.