ELECTRCITY

Cards (86)

  • what is electric current?
    a flow of electrical charge
  • what is the unit for electric current?
    ampere, A
  • what is potential difference?

    the driving force that pushes the charge around (voltage)
  • what is the unit for potential difference?

    volts, V
  • what is resistance?

    anything that slows the flow down
  • what is the unit for resistance?
    ohms, Ω
  • what is ohm's law?
    the greater the resistance across a component, the smaller the current that flows (for a given voltage across a component)
  • what is the rate of charge?

    the size of the current
  • what is the equation for charge flow?
    charge flow = current × time
    Q = I × t
  • what is the diagram for a cell?
  • what is a battery?

    a number of electrical cells in series
  • what is the diagram for a battery?
  • what is a diode?
    a component that only allows current to flow in one direction
  • what is the diagram for a diode?
  • what is a variable resistor?
    a component that are altered continually as they work
  • what is the diagram for a variable resistor?
  • what is an LED?

    a diode that emits light when it conducts
  • what is the diagram for an LED?
  • what is a filament lamp?

    a common type of light bulb
  • what is the diagram for a filament lamp?
  • what is the diagram for an open switch?
  • what is the diagram for a closed switch?
  • what is a fuse?
    a wire which melts if the current is too high
  • what is the diagram for a fuse?
  • what is a voltmeter?

    a device used to measure voltage
  • what is the diagram for a voltmeter?
  • what is an ammeter?
    a device used to measure current
  • what is the diagram for an ammeter?
  • what is a thermistor?

    a temperature dependent resistor
  • what is the diagram for a thermistor?
  • what is an LDR?
    a light dependent resistor
  • what happens to the resistance as the current through an ohmic resistor changes?

    remains constant
  • what happens to the resistance of a bulb as temperature of the filament increases?
    the resistance increases
  • what happens to the resistance of a thermistor as the temperature increases?
    the resistance decreases
  • what happens to the resistance of a light dependent resistor as the intensity of light increases?
    the resistance decreases
  • what are the rules for a series circuit?
    - I1 = I2 = ...
    - Vtotal = V1 + V2 + ...
    - Rtotal = R1 + R2
  • what happens when you add resistors to a series circuit?

    total resistance increases, total current decreases
  • what happens when you add resistors to a parallel circuit?
    total resistance decreases, total current increases
  • what does dc stand for?

    direct current
  • what is direct current?
    current that flows in one direction