What makes a good insulator?

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What makes a good conductor?
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How are voltage and current related?
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How does a resistor work?
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What is the energy transformation in a toaster?

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How do solar panels (cells) work?
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How do you make a complete circuit?

To make a complete circuit, you need to connect a power source (such as a battery) to a load (such as a light bulb) through a closed loop of conductive material (such as wires). This allows the flow of electric current from the power source to the load and back again, completing the circuit.