6. Series and Parallel Circuits a. What happens to current in other lamps if one
ID: 1780409 • Letter: 6
Question
6. Series and Parallel Circuits a. What happens to current in other lamps if one lamp in a series circuit burns out? b. What happens to the brightness of light from each lamp in a series circuit when more lamps are added to the circuit? What happens to the current in other lamps if one of the lamps in a parallel circuit burns out? c. d. What happens to the brightness of light from each lamp in a parallel circuit when more lamps are added in parallel? For a given voltage, what happens to the amount of current that flows in your skin when you perspire? Explain. 7. What is the purpose of having fuses or circuit breakers in electric circuits? How should they be connected in circuits so they will be effective? 8. Explain what AC and DC are. Why is AC used by electric utilities? Why is DC used in flashlights 9.Explanation / Answer
6) a) the circuit path is broken & currents ceases. All lamps go out
b) If light lamps are connected in series to a voltage source, the brightness of the individual bulbs diminishes as more and more lamps are added to the “chain”. The current decreases as the overall resistance increases.
c) If one lamp in a parallel circuit burns out, the other lamps are unaffected because current still flows through them.
d) If light lamps are connected in parallel, the lamps will be more brighter as The current increases due to the overall resistance decrease.
7) The amount of current that flows in your skin when you perspire increases because the resistance decreases.
8) Fuses and Circuit Breakers (CB) are used for the protection of power system. These along with other protective equipment like relays, isolater, switches, are collectively called as switchgear(switching equipment used in power systems).
The basic function is to break the circuit in case of faulty conditions so as to protect the power system equipment and auxiliaries.
Fuses are always connected in series with the component(s) to be protected from overcurrent, so that when the fuse blows (opens) it will open the entire circuit and stop current through the component(s). A fuse connected in one branch of a parallel circuit, of course, would not affect current through any of the other branches.
9) Both AC and DC describe types of current flow in a circuit. In direct current (DC), the electric charge (current) only flows in one direction. Electric charge inalternating current (AC), on the other hand, changes direction periodically.
The use of AC makes the transmission of electrical power to great distances much more economical.
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