You can but it is not recommended.
You can plug in as many as you want but none of them will work. An "open" circuit is an electrical circuit which is not a complete circuit and therefore electricity will not flow through it. If you mean an unused circuit,which has no load on it, then the answer is 2 ea. 5 amp devices on a 15 amp circuit and 3 ea. 5 amp devices on a 20 amp circuit. The reason for this is that any circuit is not to be "loaded" more than 80% of the OCPD (circuit breaker amperage rating.
Yes, the amp rating is a measurement of the highest amp load it should carry. So a 15 amp appliance will work on a 20 amp socket but you wouldn't want to use a 20 amp appliance on a 15 amp socket.
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.
120 15 amp service ? 210 7 amp service ?
No, the one amp fuse is the recommendation of the manufacturer of the circuit. By replacing it with a fuse five times larger will default the warranty placed on the equipment by the manufacturer. Where one amp will do no damage to the circuit, five amps could destroy the components that are connected in the circuit.
5 amp,10 amp, 15 amp, 20 amp, 25 amp, and 30 amp.
Yes
The main difference between a 5 amp fuse and a 6 amp fuse lies in their respective current-carrying capacities. A 5 amp fuse is designed to safely carry up to 5 amperes of current before breaking the circuit to protect the electrical components from damage due to overload. On the other hand, a 6 amp fuse can handle up to 6 amperes of current before breaking the circuit. Therefore, the 6 amp fuse has a slightly higher current rating and can tolerate a slightly higher load compared to the 5 amp fuse.
It's basically a system of circuits. The power from the mains enters through the input terminals. It's then split into various load circuits (5 amp for lighting, 13 amp for sockets , 15 amp for the immersion heater & 30 amp for cookers). Each of these circuits has it's own circuit breaker, which cuts the power to that particular circuit if the current draw exceeds the rating of the breaker.
In how many amps of current before blowing out. 2 amp 5 amp 10 amp 15 amp etc.
If it is then it has a 3 or 5 amp fuse. Some are not.
It can be done although it is bad practice provided the load doesn't continuously require more that 15 A. You should then use a 15 A fuse to protect the switch. Actually a fuse or circuit breaker is only there to protect the wiring and device and nothing else, e.g., if you run 14AWG wire then you want to protect that with a 15A (or smaller) fuse or breaker. Similarly 12AWG wire should be protected by a 20A (or smaller) fuse or breaker. The receptacles will only accept devices rated for them, i.e., NEMA 5-15R is rated at 125V 15A. NEMA 5-20R is rated at 125V 20A... the 5-20R is commonly known as "T" rated as it will accept either NEMA 5-15P or 5-20P plugs. The 5 indicates that it is a 125V rated 2-pole, 3-wire grounding receptacle.. the 15 or 20 is it's current rating.