UNIT 3.1 - ELECTRIC CIRCUITS

Flashcards by Mr S Lee, created more than 1 year ago

This topic explores the relationship between current and potential difference and develops the idea of resistance. It investigates how potential differences and currents are related in series and parallel circuits and how the total resistance in series and parallel circuits can be calculated. It introduces the concept of power in an electricalcircuit as the energy transferred per unit time and introduces the equations which enable the power transferred by an appliance to be calculated.

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	Created by Mr S Lee over 6 years ago

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What does this circuit symbol represent?

What is electric current ( I )?

How do we measure current ( I )?

What is voltage
( V )?

How do we measure voltage ( V )?

What is resistance ( R )?

How do we measure resistance ( R )?

What will happen if Lamp 1 breaks?

The current leaving the cell is 4A.

What would the current be at:

- A1
- A2
- A3

What would the voltmeter readings be at:

- V2
- V3

What would the current be at:

- A1
- A2
- A3

What would the voltmeter readings be at:

- V1
- V2
- V3

What does this circuit symbol represent?

A variable resistor is a resistor for which it is possible to alter the resistance. Variable resistors can be put into a circuit to control the current and the voltage.
Suggest 2 household uses for variable resistors?

Calculate the voltage across a
15 Ω fixed resistor, carrying a current of
1.8 A.

Calculate the current through a
2 kΩ resistor when there is a voltage of
230 V across it.

An electric fire with a current of 4 A flowing through it has a voltage of
230 V across it.
Calculate the resistance of the wire in the electric fire.