The current and power drawn by the load

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SUMMARY

The discussion focuses on calculating the transformer turns ratio, current, and power drawn by a 36Ω resistive load connected to a transformer with a secondary terminal potential difference (p.d.) of 24V and a primary supply of 480V AC. The transformer turns ratio is determined using the formula Vp/Vs = Np/Ns, resulting in a ratio of 20:1. The current drawn by the load is calculated as 0.667A, leading to a power consumption of 16W. The current drawn from the supply is calculated to be 13.3A.

PREREQUISITES
  • Understanding of Ohm's Law (V=IR)
  • Familiarity with transformer equations (Vp/Vs = Np/Ns)
  • Knowledge of power calculations (P=IV)
  • Basic concepts of AC circuits and resistive loads
NEXT STEPS
  • Study transformer turns ratio calculations in-depth
  • Learn about power factor and its impact on AC circuits
  • Explore advanced transformer efficiency analysis
  • Investigate the effects of load variations on transformer performance
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Electrical engineering students, professionals working with transformers, and anyone involved in AC circuit analysis and power calculations.

lemon
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Homework Statement


A 36Ω resistive load is connected to the secondary of a transformer. The terminal p.d. at the secondary is 24v. If the primary is connected to a 480v a.c. supply, calculate:

a) the transformer turns ratio
b) the current and power drawn by the load
c) the current drawn from the supply

Homework Equations


1: V=IR
2:Vp/Vs=Np/Ns=ip/is
3: Np:Ns
P=IV

The Attempt at a Solution


a) Is=Vs/R = 24/36=0.667A
P=0.667Ax24V=16W

b) Ip=current drawn from the supply
Ip=Vp/R = 480V/36Ω=13.3A

Not sure if I'm getting this ok
Can somebody please check - thank you:smile:
 
Last edited:
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