Electricity

• The current is the flow of electrons around a circuit.
• Electric charge can be positive or negative, but electric current always flows from positive to negative.
• A battery produces an electrical potential difference (voltage) between its terminals.
• A battery provides electrical energy to make an electric current flow through a circuit.
• An ammeter measures the amount of current flowing through it, measured in Amps (A).
• A voltmeter measures the potential difference across two points on a circuit, measured in Volts (V).
• An ammeter measures the amount of current flowing through a component.
• When a component is connected across the terminals of a battery, it allows the flow of electrons through itself.
• When a component is connected across the terminals of a battery, it allows the flow of current through itself.
• Components are made up of atoms with outer shells containing electrons that can move freely within them.
• A voltmeter measures the voltage across a component.
• When a switch is closed, it allows electricity to flow through the wires and into the appliance.
• A voltmeter measures the voltage across two points in a circuit, measured in Volts (V).
• When a switch is closed, it allows electricity to flow through the wires and into the appliance.
• An appliance uses up some of the electrical energy provided by the battery to do work.
• Resistance is the measure of how difficult it is for a current to pass through a component.
• In a simple series circuit, there is only one pathway for the current to follow.
• Ohms Law states that the current passing through a resistor is directly proportional to the potential difference applied across it.
• Resistance is the measure of how much a component resists the flow of electricity through it.
• The greater the resistance of a component, the smaller the current that flows through it when connected across the terminals of a battery.
• Different materials have different resistances due to their atomic structure.
• Conductors have low resistance and allow current to pass easily.
• In metals, there are many more electrons than protons, so they have a negative charge.
• Electric charge is carried by particles called electrons.
• In series circuits, all components must be switched on at once.
• Electricity flows from positive to negative terminals.
• An ammeter measures the amount of electric charge passing through a point in a circuit per second, measured in Amperes (A) or Ampere-seconds (As).