Chapter 15
D.C. circuits
The connections determine which current and voltage relationships apply.
Spaced review
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Circuit symbols and connections
Draw components and identify the same connections in different layouts.
Series circuits
Explain the shared current, add voltage drops and find total resistance.
Parallel circuits
Identify equal branch voltages, add branch currents and find effective resistance.
Solving a complete circuit
Reduce a network, recover individual readings and explain what changes when a branch opens.
Potential dividers and the potentiometer
Relate the output voltage to the chosen terminals and wiper position.
Thermistor and LDR circuits
Explain how temperature or light changes resistance and the output of a powered divider.