PLEASE ANSWER EVERYTHING

you just have to answer all 3 experiments

Procedure: Set up the circuit with a battery, a single lamp, and a switch, as shown. A) Close the switch and observe the brightness of lamp A. We will consider lamp A as our indicator lamp, i.e. it's brightness will serve as an indication of the current flow. In all of these experiments will only consider large differences, not small ones due to some manufacturing differences. A B) Predict what will happen to the brightness of A if you add an identical lamp in series with A. Build this new circuit and describe what happens to the brightness of lamp A when the switch is closed.C) Predict what will happen to the brightness of A if you add an identical lamp in series with the two lamps already present. Build this new circuit and describe what happens to the brightness of lamp A when the switch is closed. D) In this experiment you have observed what happens to an indicator lamp as more lamps are added in series to the circuit. What can you infer about the current through the indicator lamp, and hence the battery, as each lamp is added in the circuit. It appears as if the lamps resist or impede the flow of electricity, we can say that they have a property which we can call resistance. This is a property of the lamp itself and not of the circuit. The cumulative effect of all of the lamps is the total or net resistance of the circuit. What happens to the total resistance as more lamps are added in series to the circuit? How can you tell? E) Invent a rule to summarize your results. Your rule should allow you to predict whether the current through the battery will increase, decrease or remain the same as the total resistance of the circuit is changed