How do you calculate power dissipated in a resistor?

To calculate power dissipated in a resistor, use the formula P = VI or P = I²R.

Power dissipated in a resistor refers to the amount of energy that is converted into heat as electric current flows through it. This can be calculated using the formula P = VI, where P is power in watts, V is voltage in volts, and I is current in amperes. Alternatively, the formula P = I²R can be used, where R is the resistance in ohms.

It is important to note that power dissipation can cause the resistor to heat up, which can affect its performance and lifespan. To prevent overheating, it is important to choose a resistor with a power rating that is higher than the expected power dissipation.

In some cases, it may be necessary to calculate the power dissipation of a circuit as a whole, rather than just a single resistor. This can be done by summing the power dissipation of each individual resistor in the circuit.

A-Level Physics Tutor Summary: To find out how much energy turns into heat in a resistor, use the formula P = VI or P = I²R. Here, P is the power in watts, V is voltage, I is current, and R is resistance. Make sure the resistor can handle more power than calculated to avoid damage. For a whole circuit, add up the power used by each resistor.