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Figure out how to measure current and voltage.
Questions:
1) Imagine you're an engineer making a string of battery powered holiday lights. If a bulb burns out current
cannot flow through that bulb any longer (like if the wire at the bulb has been cut). Figure out how to hook
up 2 light bulbs and a battery so that when one bulb burns out (or is disconnected) the other stays lit.

The bulbs should be connected in parallel.

Explanation:

We want to find out a way to hook  up 2 light bulbs and a battery so that when one bulb burns out or is disconnected the other bulbs stays lit.

We must connect the two bulbs in parallel so that even when one bulb is burns out, it will have no effect on the other bulb and the 2nd bulb will keep on working. The current flowing in each bulb will depend upon the resistance of each bulb and the voltage will be same across each bulb.

On the other hand, if we use a series circuit then if one bulb burns out then the there is no flow of current in the circuit and therefore, the second bulb will not be operational.

The current flowing through each bulb is given by

I = V/R

The voltage across each bulb is given by

V = IReq

Where I is the current and Req is the equivalent resistance of the two bulbs connected in parallel and is given by

Req = (R₁*R₂)/(R₁+R₂)

The connection diagram is attached where two bulbs are connected in parallel and are power with a battery.

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explanation:

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the answer is b, have negligible mass