electricity

• components of a circuit

  Cell

  A) cell

  B) positive

  C) negative

  
• components of a circuit

  ammeter

  A) ammeter

  
• components of a circuit

  battery

  A) battery

  
• components of a circuit

  diode

  A) diode

  
• components of a circuit

  filament lamps

  A) filament lamp

  
• components of a circuit

  LDR - light dependant resistor

  A) LDR

  
• components of a circuit

  led

  A) LED

  
• components of a circuit

  resistor

  A) resistor

  
• components of a circuit

  switch

  A) open

  B) closed

  
• components of a circuit

  V.R

  A) variable resistor

  
• components of a circuit

  thermistor

  A) thermistor

  
• components of a circuit

  V

  A) voltmeter

  
• What happens when the temperature goes up in a circuit with a thermistor?

  When the temperature rises, the resistance of the thermistor decreases.
• What does Ohmic mean?

  Resistance is always constant (eg - resistor)
• What happens when the light intensity increases in a circuit with an LDR?

  When the light intensity increases, the resistance decreases. They are inversely proportional.
• What does non-ohmic mean?

  Resistance is not always constant (eg - filament lamp)
• What does LDR stand for?

  Light Dependant Resistor
• Light + current

  If there is no light, the current cannot pass.
• What is the symbol, unit, and unit symbol of charge?

  Symbol - Q, Unit - Coulombs, Unit Symbol - C
• What is the symbol, unit, and unit symbol of current?

  Symbol - I, Unit - Amps (Ampere), Unit symbol - A. measured with an ammeter.
• What is the symbol, unit, and unit symbol of voltage/potential difference?

  symbol - V/ p.d., unit - volts, unit symbol - V. measured with a voltmeter
• What is the symbol, unit, and unit symbol of resistance?

  symbol - R, unit - Ohms unit symbol - Ω
• What is the symbol, unit and unit symbol of energy transferred/work done?

  symbol - E, unit - joules, unit symbol - J
• What is the equation for Ohms Law?

  V=IR

  Voltage/P.D.=Current x Resistance

  I=V/R

  R=V/I
• What is current?

  Current is the rate of flow of charge.
• What is power?

  Power is the rate of transfer of energy.
• What is the equation for power?

  Power(W)=energy transferred(J) / times(s)

  P=E/t

  P=IV

  P = 1^2 x R
• What is the equation for power in terms of voltage?

  P=IV

  Power (W) = Current (A) x Voltage (V)
• What is the equation for power in terms of resistance?

  P=I^2xR

  Power (W) = Current (A)squar

  ed x Resistance (Ω)
• What is charge?

  Charge is the number of charged particles and how much charge.
• What is the equation for energy transfer in terms of charge and voltage?

  E=VQ

  V=E/Q

  Q=E/V

  Energy Transferred = Voltage x Charge
• What is the equation for charge?

  Q=IT

  Charge = Current x Time
• What direction do field lines point?

  They point towards negative and away from positive.
• Explain how the charged rod affects the stream fo water.

  Rod attracts or repels water because water has a charge of both + and -.
• What is Ohms Law?

  • Current is proportional to the voltage
  • current is inversely proportional to resistance.
• what two factors does the current in a circuit depend on?

  1. potential difference
  2. resistance