PHYS 101 Lecture Notes - Lecture 36: Electrical Network

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byzantiumhorse747

28 Mar 2017

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Document Summary

The current is the samethrough every light bulb. The current is resisted by the first bulb, by the second bulb and by the third bulb. If the current pathway is interrupted anywhere, the current stops flowing. The total resistance is the sum of the individual resistances on the path. There are two basic ways to connect the elements of an electrical circuit: in series or in parallel. When connected in series, the circuit elements offer one single pathway for the electrons to flow. When connected in parallel, the pathways for electron flow branch out. In a parallel combination, the three lamps are connected between the same points a and b in the circuit. The potential difference across each lamp is the same (it is the same as the potential difference between points a and b). The total current in the circuit divides among the parallel branches. The current in each branch is inversely proportional to the resistance in each branch.

Related Questions

4.The current through two identical light bulbs connected in aseries is 0.25 amps. The voltage across both bulbs is 100 volts.Find the resistance of a single light bulb.

5. What is the difference between series and parallel circuits?Specify in words and algebraic formula, if possible, therelationships between current, voltage, and resistance in each typeof circuit.

6. Describe in detail the effects of a magnetic field on acurrent-carrying wire.

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 that supports this statement. If a statement is FALSE, give a correct statement, and briefly describe the evidence from this lab that supports this new statement.

a. The current flows from the battery, through wire A, through the bulb, and then back to the battery through wire B

b. Since the current is used up by the bulb, the current in wire B is smaller than the current in wire A

c. 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.

e. A current sensor will read the same magnitude if connected to measure the current in wire A, and then connected to measure the current in wire B.

3. Name the circuit element represented by each of the following symbols: