A transformer is used to light a 100 ,W-110 , | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) Given: Output power $(P_{out})$ = $100 \,W$, Input voltage $(V_{in})$ = $220 \,V$, Input current $(I_{in})$ = $0.5 \,A$.The input power $(P_{in})$

Vedclass · Accepted Answer

$90$

Vedclass · Answer

(A) Given: Output power $(P_{out})$ = $100 \,W$, Input voltage $(V_{in})$ = $220 \,V$, Input current $(I_{in})$ = $0.5 \,A$.The input power $(P_{in})$ is calculated as $P_{in} = V_{in} 	imes I_{in} = 220 \,V 	imes 0.5 \,A = 110 \,W$.The efficiency $(\eta)$ of a transformer is defined as the ratio of output power to input power: $\eta = \frac{P_{out}}{P_{in}} 	imes 100$.Substituting the values: $\eta = \frac{100 \,W}{110 \,W} 	imes 100 = \frac{10}{11} 	imes 100 \approx 90.91 \%$.Rounding to the nearest provided option, the efficiency is $90 \%$.

$A$ transformer is used to light a $100 \,W-110 \,V$ lamp from a $220 \,V$ mains. If the main current is $0.5 \,A$, the efficiency of the transformer is: (in $\%$)

Similar Questions

The efficiency of a transformer is very high because

$A$ power transformer (step-up) with a $1:8$ turn ratio has $60\, Hz, 120\, V$ across the primary; the load in the secondary is $10^4\ \Omega$. The current in the secondary is:

$A$ step-down transformer connected to an $AC$ mains supply of $220 \, V$ is made to operate a $11 \, V, 44 \, W$ lamp. Ignoring power losses in the transformer,what is the current in the primary circuit? (In $A$)

What is a transformer? Write its principle and describe its construction.

What is increased in a step-down transformer?

Vedclass Test Series

Exam Paper Generator

Online Exam Module