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Analogue Electronics

4 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

What makes a signal analogue, and how do we describe a repeating waveform using its amplitude, period and frequency?

Describe an analogue signal, read a waveform on an oscilloscope, and calculate amplitude, period and frequency
A focused answer to the O-Level Electronics outcome on analogue signals. What makes a signal analogue, reading a waveform, and calculating amplitude, period and frequency from an oscilloscope trace.
8 min answer →

How can a capacitor charging through a resistor create a time delay that switches something on a few seconds after a button is pressed?

Explain how a capacitor charging through a resistor produces a time delay and how the delay depends on resistance and capacitance
A focused answer to the O-Level Electronics outcome on time delays. How a capacitor charging through a resistor delays a transistor switch, and how R and C set the delay time.
8 min answer →

How can two resistors split a supply voltage into a smaller, chosen value, and what happens when one of them is a sensor?

Apply the potential divider equation to find an output voltage and explain how a sensor in a divider produces a varying voltage
A focused answer to the O-Level Electronics outcome on the potential divider. The divider equation, choosing resistors for a wanted output, and using a sensor in a divider to make a varying voltage.
9 min answer →

How do we combine a sensor, a potential divider and a transistor to make a circuit that switches a load automatically?

Explain a sensor-driven transistor switching circuit and design one to turn a load on in the dark or when it is hot
A focused answer to the O-Level Electronics outcome on transistor switching. Combining a sensor potential divider with a transistor and base resistor to switch a load on automatically.
9 min answer →