Electricity can only flow in a closed circuit. An electrical circuit consists of a current source (e.g. battery), consumers (e.g. incandescent bulbs, starter) and wires, with the help of which they are connected to each other through switches, relays and fuses, the source and consumers of current.
Imagine a water pipe in which a certain amount of water flows under a certain pressure: this system can be compared to an electrical circuit.
Voltage: Voltage corresponds to the pressure of water in the water supply, it is measured in volts (IN).
Current strength: The current strength corresponds to the amount of water flowing through the pipeline for a certain period of time. The unit of current is the ampere (A).
Power: The product of voltage and current shows how much electrical energy the current source gives to the consumer. Power is measured in watts (Tue).
Resistance: Resistance can be compared to a shut-off valve in a pipeline. If the faucet is fully open, then the water is odd unhindered (resistance 0). If you cover the tap, the resistance increases until the water stops flowing at all (infinite resistance). The unit of resistance is Ohm.
Wires: The wires match the pipes. The diameter of the pipeline depends on the consumer. A wire with a cross-section of 0.5 mm2 is sufficient for a pilot lamp, while a 16 mm wire is required for a starter. Too thin wire heats up, and the voltage drops. In this case, for example, not 12 volts is applied to the headlight, but, say, only 10 or 9.5 volts, and the headlight becomes dim.
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