Efficiency is typically associated with minimizing losses in a circuit. If you have no load you couldn't compute efficiency. If there is a load you need to determine what you are trying to measure. For example, in an incandescent light bulb a lot of power is wasted in heat. So if light is what you are looking for an incandescent bulb isn't very efficient. A compact fluorescent would be more efficient. However, if you were using a light bulb to power an "Easy Bake" oven it would be more efficient.
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If you are comparing parallel vs series circuits, light bulbs produce more light in parallel circuits.
Loads receive current independently of each other.
small scale integrated circuits contain about 10 transistorsmedium scale integrated circuits contain about 100 transistorslarge scale integrated circuits contain about 1000 transistorsvery large scale integrated circuits contain about 10,000 transistorsultra large scale integrated circuits contain about 100,000 transistorsetc.modern digital integrated circuits contain about 100,000,000,000 transistors and sometimes much more
Microelectronics, digital circuits, analogue circuits, transmission lines, Radio Frequency (RF), power, high voltage, integrated circuits, computers, networking and many more.