274686
A step up transformer operates on a $230\text{V}$ line and supplies a current of 2 ampere. The ratio of primary and secondary winding is $1:25$. The current in primary is
1 $25\text{A}$
2 $50\text{A}$
3 $15\text{A}$
4 $12.5\text{A}$
Explanation:
(b) $\frac{{{\text{n}}_{\text{p}}}}{{{\text{n}}_{\text{s}}}}=\frac{{{\text{E}}_{\text{p}}}}{{{\text{E}}_{\text{s}}}}=\frac{1}{25}\therefore {{\text{E}}_{\text{s}}}=25\cdot {{\text{E}}_{\text{p}}}$
But ${{E}_{S}}{{I}_{S}}={{E}_{p}}{{I}_{p}}\Rightarrow {{I}_{p}}=\frac{{{E}_{S}}\times {{I}_{S}}}{{{E}_{p}}}\Rightarrow {{I}_{p}}=50A$
NCERT Page-261 / N-195
AC (NCERT)
274687
In a transformers, number of turns in primary coil are 140 and that in secondary coil are 280 . If current in, primary coil is $4\text{A}$, then that in secondary coil is
1 $4\text{A}$
2 $2\text{A}$
3 $6\text{A}$
4 $10\text{A}$
Explanation:
(b)
NCERT Page-261 / N-195
AC (NCERT)
274688
A current flowing in a step down transformer (220V to $22\text{V}$ ) having impedence $220\pi $, is
274686
A step up transformer operates on a $230\text{V}$ line and supplies a current of 2 ampere. The ratio of primary and secondary winding is $1:25$. The current in primary is
1 $25\text{A}$
2 $50\text{A}$
3 $15\text{A}$
4 $12.5\text{A}$
Explanation:
(b) $\frac{{{\text{n}}_{\text{p}}}}{{{\text{n}}_{\text{s}}}}=\frac{{{\text{E}}_{\text{p}}}}{{{\text{E}}_{\text{s}}}}=\frac{1}{25}\therefore {{\text{E}}_{\text{s}}}=25\cdot {{\text{E}}_{\text{p}}}$
But ${{E}_{S}}{{I}_{S}}={{E}_{p}}{{I}_{p}}\Rightarrow {{I}_{p}}=\frac{{{E}_{S}}\times {{I}_{S}}}{{{E}_{p}}}\Rightarrow {{I}_{p}}=50A$
NCERT Page-261 / N-195
AC (NCERT)
274687
In a transformers, number of turns in primary coil are 140 and that in secondary coil are 280 . If current in, primary coil is $4\text{A}$, then that in secondary coil is
1 $4\text{A}$
2 $2\text{A}$
3 $6\text{A}$
4 $10\text{A}$
Explanation:
(b)
NCERT Page-261 / N-195
AC (NCERT)
274688
A current flowing in a step down transformer (220V to $22\text{V}$ ) having impedence $220\pi $, is
274686
A step up transformer operates on a $230\text{V}$ line and supplies a current of 2 ampere. The ratio of primary and secondary winding is $1:25$. The current in primary is
1 $25\text{A}$
2 $50\text{A}$
3 $15\text{A}$
4 $12.5\text{A}$
Explanation:
(b) $\frac{{{\text{n}}_{\text{p}}}}{{{\text{n}}_{\text{s}}}}=\frac{{{\text{E}}_{\text{p}}}}{{{\text{E}}_{\text{s}}}}=\frac{1}{25}\therefore {{\text{E}}_{\text{s}}}=25\cdot {{\text{E}}_{\text{p}}}$
But ${{E}_{S}}{{I}_{S}}={{E}_{p}}{{I}_{p}}\Rightarrow {{I}_{p}}=\frac{{{E}_{S}}\times {{I}_{S}}}{{{E}_{p}}}\Rightarrow {{I}_{p}}=50A$
NCERT Page-261 / N-195
AC (NCERT)
274687
In a transformers, number of turns in primary coil are 140 and that in secondary coil are 280 . If current in, primary coil is $4\text{A}$, then that in secondary coil is
1 $4\text{A}$
2 $2\text{A}$
3 $6\text{A}$
4 $10\text{A}$
Explanation:
(b)
NCERT Page-261 / N-195
AC (NCERT)
274688
A current flowing in a step down transformer (220V to $22\text{V}$ ) having impedence $220\pi $, is
