Power, Energy, and Transformers

• Calculate the energy transferred in an electric circuit using the relationship between potential difference and total charge.

$E = Q \times V$

• Apply the relationships between power, potential difference, current, and resistance in circuit devices.

$P = V \times I$

$P = I^2 \times R$

• Use the concept of conservation of energy to demonstrate that a step-up transformer must decrease output current, and vice versa.
• Apply the equation for potential difference and current across primary and secondary transformer coils.

$V_p \times I_p = V_s \times I_s$

• Explain why transmitting power at higher voltages is a significantly more efficient method of energy transfer.