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--- electronics [2022/06/24 21:00] – created - external edit 127.0.0.1
+++ electronics [2023/01/11 08:11] (current) – external edit 127.0.0.1
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 electronics begins with the vacuum tube and the transistor
+==== Resistor ====
+Can be used in these ways:
+  * current limiting
+  * voltage limiting
+  * pull-down
+  * pull-up
+=== Current Limiting Resistor ===
+Wire in series with an LED.
+A **braking resistor** is a special case of the limiting resistor used in DC motors and
+can be used in three braking circuits:
+  * plugging, or counter-current, braking
+  * dynamic, or rheostatic, braking
+  * regenerative braking
+=== Voltage Limiting Resistor ===
+Create a **voltage divider circuit** with two resistors.
+Limit voltage to any value.
+=== Pull-down Resistor ===
+Place between an open switch and ground, to force the switch to appear open.
+=== Pull-up Resistor ===
+Place resistor between an open switch and the voltage source, to force the switch to appear closed.