The formula you are looking for is Watts = Amps x Volts.
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You can safely connect up to 10 70-watt lights on a 15 amp circuit. Each 70-watt light draws 0.58 amps, so you would not exceed the circuit's 15 amp capacity with 10 lights.
A 15 amp circuit can handle approximately 8-10 60 watt bulbs. Each 60 watt bulb draws 0.5 amps of current, so you divide the circuit's amp rating (15 amps) by the current draw per bulb (0.5 amps) to get the approximate number of bulbs it can handle.
As a general guideline, you can typically install about 10-12 LED recessed lights on a 20 Amp circuit breaker. However, the exact number may vary depending on the wattage of the lights and any other devices connected to the circuit. It's recommended to consult with a licensed electrician to ensure proper installation and avoid overloading the circuit.
For a 1500 watt hot water heater connected to a 110 volt power source, you would need a 13.6 amp circuit. It is recommended to use a 15 amp circuit to provide some safety margin.
1 amp
A 300 watt bulb requires a circuit breaker of at least 2.5 amps. This can be determined by dividing the power (300 watts) by the voltage (120 volts). However, considering normal breaker sizes, a 5 amp breaker would be sufficient for a 300 watt bulb.