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OpenStudy (anonymous):
A circuit has a 9V battery, a rheostat and an LED connected in series. The LED is marked 'maximum current 25mA when the p.d is 1.7V.' Calculate the minimum value of the resistance of R.
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OpenStudy (nikvist):
\[R_{\min}=\frac{9-1.7}{0.025}\Omega=292\Omega\]
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