2.3 Currents in Electrical Ciruits Flashcards by Jamie McLeman

What is the current in an electrical circuit?

The flow of electric charge round a circuit

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What is the potential difference/voltage?

The work done per coulomb of charge that passes between 2 points in a circuit

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What are the characteristics of components connected in series?

The total resistance is the sum of the resistance of all the components in the circuit
The current is the same everywhere in the circuit
The total potential difference is shared between the components

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What are the characteristics of components connected in parallel?

The potential difference across each component is the same
The total current through the whole circuit is the sum of the currents through the separate components

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What does an LED do and what does it stand for?

Light Emitting Diode - emits light when a current flows through it in the forward direction

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What does an LDR do and what does it stand for?

Light Dependant Resistor - The resistance decreases as light intensity increases

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What does a thermistor do?

It’s a temperature dependant resistor, the resistance decreases as the temperature increases

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How is static electricity made?

Insulating materials are rubbed against each other. Electrons move from one material to the other. One material is positively charged and the other is negatively charged

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What happens to objects that carry the same charge?

They repel

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What happens to objects that have different charges?

They attract

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