No more than 13.
Go to your distribution panel and shut off the breaker that you think is the circuit in question. If the circuit becomes de-energized then the breaker you just turned off feeds that circuit. Look on the handle of the breaker and the number you see is the amperage of that circuit. <<>> Determination of a 15 or 20 Ampere circuit is normally indicated by a combination of a 20A breaker and a 20A dedicated outlet. A 15A circuit normally has multiple outlets; not typical in a 20A circuit.
The National Electrical Code (US) allows up to thirteen 20 amp receptacles on a 20 amp circuit. 120V x 20A = 2400 VA each duplex receptacle is calculated at 180 VA 2400 / 180 = 13.3333 receptacles, since you can't put a third of a receptacle in, you have to round down to 13.
Assume a single breaker controlling a number of outlets. The black wire is HOT, the white wire is Neutral and the green or bare wire is Ground. The wires and outlets should match the rating of the breaker in Amps. Typically 15 A for 14 Gauge wire. (I prefer 20A outlets and 12 gauge wire). You must calculate the expected load at each outlet. The electric code may be different in each locale, but 8 to 10 outlets on a circuit might be typical for general usage. That is over an amp per outlet. If you had a situation where you knew you would be plugging in a high amp device liek an electric heater you might only have 1 outlet on circuit. You wire the outlets in a circuit in parallel and make certain each is wired identically. The Black wire should always be on the copper colored screw and the white on silver screw and the ground on the green screw. For a couple of bucks you can buy an outlet tester. It is usually yellow with a three prong plug and lights that tell you if an outlet is wired correctly with power turned on. The lights identify problems based on which lights are lit.
Depends on how many amps it pulls and the size of the wire in the circuit.
While 7 is pushing the upper limits, the main concern should be "what will the outlets be running? If you're putting a freezer out there, it should probably be on a separate circuit. If you'll be running any high amperage equipment; again, put it on a separate circuit.
If you know what you're doing, you can probably accomplish that in a 1A circuit.
It will depend on how big the circuit is if its a 20a no if its 40a yes!
20 amp circuit breaker
A disconnected or broken wire along the path somewhere. If you have 5 outlets (in a row) on a breaker and the wire breaks at the 3rd outlet, the first two outlets will still work but the others will not. Rodents are known to gnaw on wires and that can cause the break. Or maybe a wire just came loose from a recepticle.
With a 15 A breaker you need 14 Gauge wire. Normally you would only put 8 outlets on a 15 A circuit. If you have the option you shoudl consider a 20 A circuit, use 20A receptacles and 12 gauge wire. Comment: The question was on a homeowners electrical exam. My answer was also 14 gauge however, the tester said the answer was 12 ga. I thought maybe there was something special about the 10 outlets. For example, 10x180 VA per outlet/120V = 15 A which is right at the limit for 14 ga but would be 75% for the 12 ga wire.
Divide 20A by the Amps listed on the label of each fixture ballast. A T8 bulb will use an electronic ballast. They generally run 1A for four 4 foot bulbs. Try 15 four bulb fixtures per circuit and use a 20A rated switch.
Usually 15A or 20A, but it depends on the wire used.