8.2 Simple Circuits
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Allow or Resist Conductors __________ the flow of electricity.
Allow
Allow or Resist Insulators _________ the flow of electricity.
Resist
Electrical current definition:
The movement/flow of electrons around a closed circuit.
A current carries energy from the:
Battery to the light bulb
A complete circuit must have:
An energy source, a pathway, and a load.
Energy source:
Provides continuous charges. eg. battery
Pathway:
Charges flow along this and it must be conductive. eg. wires
Load:
Converts electrical energy into other forms. eg. lightbulb
A closed circuit is:
Complete.
A complete circuit can be opened and closed with a:
Switch.
Current measures:
The number of charges per second travelling around an electrical circuit.
An ammeter measures:
The electrical current in a circuit.
For an ammeter to work it has to be:
Connected in the series circuit.
Voltage is a measure of:
The electrical energy in a circuit. eg. more volts = more energy = more light from a light bulb.
A voltmeter measures:
Voltage
For a voltmeter to work it has to be:
Connected in a parallel circuit across from where the voltage is measured. eg. a battery
Hose analogy Voltage is like:
The water pressure of a hose.
What is DC?
Direct Current. Electrons flow in one direction only. eg. battery-powered circuits are DC.
What is AC?
Alternating Current. Current changes direction 50 times every second. eg. main power in our houses are AC.