Section 1
Transistors as Amplifiers and Defining Current
Define amplifier as it relates to electronics.
Match these units to the terms they represent.V, A, W, hose width, force, coulombs per second, gravity, $\mathrm{ft}^3 / \mathrm{sec}, \mathrm{I}, \mathrm{R}$, current
Define the two combined factors that make a current.a._________________________b._________________________
What is a basic unit used to show current in the following?a. Water systemb. Electrical system
Write without scientific notation how many electronics there are in a 1-coulomb charge.
There are 0.0153 amperes in the LED circuit. Write out exactly how many electrons pass a single point in the wire in 1 second.$$=1.5310^{16} \text { electrons }$$Recognize that this is considered a very small current.
Now it is time to observe the actual effect that different resistors have on the current.In Lesson 5, you used the same circuit as the one shown in Figure L49-13. At that time, you observed what happened as you changed resistors. Now you get to understand what happened. Measure the resistors used here with your DMM. Do all figuring here to three significant figures. This means that in terms of accuracy, all numbers have three digits. For example, a 10-kilo-ohm resistor has two significant figures because the color coding only shows two digits. On the DMM it might show 9.96 kilo-ohms. That shows three significant figures.You can copy most of the information from the exercise you did for Lesson 5 to Table L49-1.
Think of your garden hose.a. If you turn the hose on, the pressure comes from where?b. Pressure in an electronic system is called what?c. If you leave the pressure the same and squeeze the hose, this increases what?d. As you increase the resistance, what happens to the current?e. If voltage in a system remains constant, current will decrease if resistance is what?f. Conversely, the current will increase when resistance is what?