HoMEWORK FOR LAB 4 BATTERIES, BULBs, AND CURRENT 1. Is there any difference betw

Question

HoMEWORK FOR LAB 4 BATTERIES, BULBs, AND CURRENT 1. Is there any difference between the static charges generated by rubbing rods with fur or silk and the charges that flow (from a battery) through wires in an electric circuit? Give evidence for your answer 2. For the circuit on the right, indicate whether the statements below are TRUE or FALSE If a statement is TRUE, briefly describe the evidence from this lab which supports this statement. If a statement is FALSE, give a correct state- ment, and briefly describe the evidence from this lab which supports this new The current flows from the battery, through wire A, through the bulb, a. and then back to the battery through wire B b. Since current is used up by the bulb, the current in wire B is smaller than the current in wire A e. The current flows toward the bulb in both wires A and B d. If wire B is disconnected, but wire A is left connected, the bulb will still light, but if wire A is disconnected and wire B is left connected, the bulb will not light. A curnent sensor will read the same magnitude if connected to measure the current in wire A, and then connected to measure the curent in wire B e. 3. Name the circuit element represented by each of the following symbols: 1 d. LAB 4 BATTERIES, BULBS, AND CURRENT 75

Explanation / Answer

Static electricity is generated by friction, or sudden contact – for instance, rubbing two materials against each other. Ordinarily, atoms are ‘uncharged’. These are considered neutral substances, but they can lose or gain electrons through friction.

The rubbing procedure can cause the atoms of particular substances to lose their electrons. This loss of electrons will make the substance or material become positively charged. The excess protons caused the substance have a positive charge. Conversely, the substance that gains the electrons is said to be negatively charged.

b) False. Because according to Kirchhoff’s rule, the current entering in the junction is same the current leaving the junction.

c) False. Direction of current should be same

d) False. To glow the bulb, circuit should be completed.

e) True. (Kirchhoff’s junction rule)

b) switch

c) wire

d) loop of wire

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