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初中电学题通常不考虑导线、电源、电表等的内阻。但在实际应用中,内阻的影响有时不能忽略。如电动机的内耗、线路消耗等。在精确测量中,电表的内阻也会影响测量结果。考虑内阻对电路的影响,相当于把内阻串联在原电路上。
Junior high school electrical problems do not usually consider the internal resistance of wires, power supplies, and meters. However, in practical applications, the influence of internal resistance can sometimes not be ignored. Such as the motor’s internal power consumption, line consumption and so on. In an accurate measurement, the internal resistance of the meter also affects the measurement result. Considering the influence of the internal resistance on the circuit, it is equivalent to connecting the internal resistance in series with the original circuit.