circuits and electricity

• Resistors limit the amount of current flowing through a circuit and convert electrical power into heat.
• Diodes allow current to flow only in one direction.
• an ammeter is used to measure current inside a circuit
• voltmeter is used to measure voltage in a circuit next to a component
• a cell provides the energy to push electrons around a circuit
• two or more cells together are called a battery
• a switch breaks or completes a circuit
• a bulb emits light when current flows through it
• fixed resistor = fixed resistance limiting current in a circuit
• variable resistor allows a changing current
• thermistor changes resistance based on temp
• fuse is a fixed resistor that breaks or melts when current is too high
• light emitting diode emits light when current flows through it
• light dependent resistor resistance decreases as light intensity increases
• resistance is slowing current down
• potential difference is the work done per unit charge flowing through a component in a circuit
• current is the flow of electrons per second (AMPS)
• $Q=$$I×t$charge = current x time
• charge is measured in coulombs