Connect a circuit using wire, a 9-V battery, an LED, a resistor, and a microammeter to measure current. Have students note what happens when they complete the circuit first by connecting the leads ...

Using properties of a series circuit, the sum of the voltages across the LED and resistor R must equal the supply voltage. \({V_s} = {V_{LED}} + {V_R}\) Now substitute the supply voltage (\(6V ...

Instead of simply replacing the outdated bulb, we decided to build a small dark detecting circuit with 2 yellow LEDs based on this Evil Mad Scientist Laboratories design. After successfully ...

The voltage developed across that series resistor can be measured ... as the pulse widths generated by the sensor circuit can’t be detected when the LED line is held high all the time.