Electric Circuits Flashcards
Electricity
The flow of electrons in a circuit
How current flow around a circuit
Electrons are repelled by the negative terminal and attached to the positive terminal they flow negative to positive terminal
Series circuit
Has only one path for electricity to flow
Parallel circuit
Has two or more paths for electricity to flow
Current
Amount of electricity flowing around a circuit
Current is measured by
Ammeter
Amps
A
Conductors
Materials that let electricity pass through
(Less resistance)
Insulators
Materials that don’t let electricity pass through (high resistance)
Voltmeters are measured by?
Voltmeter
Volts
V
Voltage
Amount of electrical energy supplied to a circuit or component
Current/amps in a series circuit
Stays the same throughout the circuit
Voltage in a series circuit
Decreases as the number of bulbs increases (Splits up)
Brightness of bulbs get dimmer
Current/amps in parallel circuit
Decreases as the number of bulbs increases (Splits up)
Voltage in a parallel circuit
Stays the same throughout the circuit
Conventional current flow
Positive terminal to negative terminal
Electron flow
Negative terminal to positive terminal
Electrical conductors
Copper
Iron
Electrical insulators
Glass, wood, plastic and
paper
How heat is transferred by conduction in poor conductors
Atoms are heated and gain energy
Vibrate more and greater amplitude
Heat is transferred from one atom to the next as kinetic energy
(Glass)
How heat is transferred by conduction in good conductors
Copper because it has free electrons which can move and collide into other atoms transferring heat energy quicker
(Metals)
Cell polarity
Cells and batteries have a long thin line represents a positive and short thick represents negative which provide voltage round the circuit
Ohms law
Voltage = (I) current x resistance (ohms)
