Since R is the quantity you have been asked to find, look at the section of

the wheel that has R in the center. The segment E2 contains the quantities

R

you have been given. The formula you would use is

The problem can

now be solved.

Given:

E = 6 volts

P = 3 watts

3.

Series Circuits

When two unequal charges are connected by conductor, a complete pathway for

current exists. An electric circuit is a complete conducting pathway. It

consists not only of the conductor, but also includes the path through the

voltage source. Inside the voltage source current flows from the positive

terminal, through the source, emerging at the negative terminal.

a. *Series Circuit Characteristics.*

A series circuit is defined as a

circuit that contains only one path for current flow. To compare the basic

current that has been discussed and a more complex series circuit, figure 19

on the following page shows two circuits. The basic circuit has only one

lamp and the series circuit has three lamps connected in series.

(1) *Resistance in a Series Circuit.*

Referring to figure 19, the

current in a series circuit must flow through each lamp to complete the

electrical path in the circuit.

Each additional lamp offers added

resistance. In a series circuit, the total circuit resistance (RT) is equal

to the sum of the individual resistances.

As an equation: RT = R1 + R2 + R3 +...Rn

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