equations

• charge (coulombs) = current (amperes) x time (seconds)
• Potential difference (volts) = current (amperes) x resistance (ohms)
• electrical power (watts) = current (amps) x potential difference (volts)
• electrical power (watts) = (current)^2 (amps) x resistance (ohms)
• energy transferred (joules) = power (watts) x time (secs)
• energy transferred (joules) = charge (coulombs) x potential difference (volts)
• p.d. across primary coil (volts) x current in primary coil (amps) = p.d. across secondary coil (volts) x current in secondary coil (amps)
• Energy (joules) = Voltage (Volts) x Current (amps) x Time (secs)