Electricity ⚡️

• What is the flow of electric charge called?

  Current (I)
• How is current measured?

  In amperes (A)
• What does voltage represent in an electrical circuit?

  The potential difference across a component
• How is voltage measured?

  In volts (V)
• What is resistance in an electrical circuit?

  Opposition to the flow of current
• How is resistance measured?

  In ohms (Ω)
• What is the formula for Ohm's Law?

  Voltage (V) = Current (I) × Resistance (R)
• If you know the current is 2 A and the resistance is 5 Ω, what is the voltage?

  $V =$$I \times R =$$2 \text{ A} \times 5 \text{ Ω} =$$10 \text{ V}$
• What are the characteristics of series circuits?

  • Current is the same throughout the circuit
  • Total resistance is the sum of all resistances
• What are the characteristics of parallel circuits?

  • Voltage is the same across each branch
  • Total current is the sum of the currents through each branch
• What are some basic circuit symbols that you should know?

  • Battery
  • Resistor
  • Bulb
  • Switch
• What is power in an electrical context?

  The rate at which energy is used
• How is power measured?

  In watts (W)
• What is the formula for calculating power?

  Power (P) = Voltage (V) × Current (I)
• If the voltage is 12 V and the current is 3 A, what is the power?

  $P =$$V \times I =$$12 \text{ V} \times 3 \text{ A} =$$36 \text{ W}$