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secondary 3 | E Maths
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Date Posted: 6 years ago
Views: 428
V=240 is constant,
V=IR
240=IR [1]
240=(I+1)(R-20)
240=IR-20I+R-20
Subst. [1]
240=240-20I+R-20
R - 20I=20 [2]
Subst. [1] into [2],
R - 4800/R = 20
R² - 20R - 4800 = 0
R=80 or R=-60(n.a.)
V=IR
240=IR [1]
240=(I+1)(R-20)
240=IR-20I+R-20
Subst. [1]
240=240-20I+R-20
R - 20I=20 [2]
Subst. [1] into [2],
R - 4800/R = 20
R² - 20R - 4800 = 0
R=80 or R=-60(n.a.)
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Date Posted:
6 years ago
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