Charge, Current & Time

• What is the definition of charge?

  Charge is a measure of total current over time
• How can charge be compared to water flow?

  Charge is the total amount of water flowed
• What symbol represents charge?

  The letter q
• In what unit is charge measured?

  In coulombs
• What is the equation for charge?

  Charge = Current × Time
• If a kettle draws 12 amps for 50 seconds, how much charge passes through the wire?

  600 coulombs
• How do you find the current if you know the charge and time?

  Rearrange to Current = Charge / Time
• How do you convert kilo coulombs to coulombs?

  Multiply by 1000
• How do you convert hours to seconds?

  Multiply by 3600
• If a phone charger transfers 43.2 kilo coulombs over 2 hours, what is the current?

  6 amps
• What is the relationship between charge, current, and time?

  • Charge (q) is total current over time
  • Equation: q = i × t
  • Current (i) is charge divided by time
• What steps are needed to solve for current when given charge and time?

  1. Rearrange the equation to i = q / t
  2. Convert units to coulombs and seconds
  3. Plug in values and calculate