Bài 1
Tóm tắt
\(I=3A\\ U=30V\\ U'=20\)
_________
\(a.R=?\Omega\\ b.I'=?A\)
Giải
\(a.R=\dfrac{U}{I}=\dfrac{30}{3}=10\Omega\\ b.I'=\dfrac{U'}{R}=\dfrac{20}{10}=2A\)
Bài 2
Tóm tắt
\(R=16\Omega\\ U=8V\\ \Delta I=0,2A\)
_________
\(a.I=?A\\ b.U'=?V\)
Giải
\(a.I=\dfrac{U}{R}=\dfrac{8}{16}=0,5A\\ b.I'=I+\Delta I=0,5+0,2=0,7A\\ U'=I'.R=0,7.16=11,2V\)