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In practice, the sources of emf always have __________. (Zero resistance, unit resistance, some resistance, infinite resistance)

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Internal resistance is always present with any practical energy source. If it is emf then internal resistance will be very low in series with the ideal emf source.
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Some internal resistance
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Physics and Maths made easy

There will be some internal resistance (though small, preferably so) for the sources of emf.
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some resistance
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Some resistance
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