PASCO EM-8622 BASIC ELECTRICITY - Manual (Page 12)

8
Basic Electricity 012-04367E
PART B
➆ Connect a single D-cell to a single light as in step 1, using a spring clip “switch” to allow
you to easily turn the current on and off. Note the brightness of the light.
⑧
Now connect the second D-cell into the circuit as shown in Figure 2.1a. What is the effect
on the brightness of the light?
⑨
Connect the second D-cell as in Figure 2.1b. What is the effect on the brightness?
➉
Finally, connect the second D-cell as in figure 2.1c. What is the effect on the brightness?
➤ NOTE: Determine the nature of the connections between the D-cells you made in steps
8-10. Which of these was most useful in making the light brighter? Which was least
useful? Can you determine a reason why each behaved as it did?
PART C
11 Connect the circuit shown in Figure 2.2. What
is the effect of rotating the knob on the device
that is identified as a “Potentiometer?”
Discussion
➀
Answer the questions which appear during the
experiment procedure. Pay particular attention
to the “NOTED:” questions.
➁
What are the apparent rules for the operation of
lights in series? In parallel?
➂
What are the apparent rules for the operation of
batteries in series? In parallel?
➃
What is one function of a potentiometer in a
circuit?
Figure 2.2 (Not to scale)
Potentiometer
Battery
Light
➤
➤ ➤
➤
➤
➤
Figure 2.1c Figure 2.1a Figure 2.1b