The LDR doesn't take anything like 2400W! In fact nothing in the circuit does except the motor. However you will need to ensure the LDR can take the current/power involved, which is a bit of calculation once you know the min resistance needed.
The LDR doesn't take anything like 2400W! In fact nothing in the circuit does except the motor. However you will need to ensure the LDR can take the current/power involved, which is a bit of calculation once you know the min resistance needed.