An electrical device operates at 12 A current and 120 V dc. it is connected with 250 V and 30 Hz ac. The power consumption will :

An electrical device operates at 12 A current and 120 V dc. it is connected with 250 V and 30 Hz ac. The power consumption will :

A
625 W
B
1250 W
C
6250 W
D
zero

Solution:

Resistance of device = $\frac{120}{12} = 10 Ω$

Power consumption = $\frac{{V^{2}}_{rms}}{R} = \frac{{(250)}^{2}}{10} = 6250 W$

Related content

Extra Questions for Class 9 Maths with Solutions Chapter Wise

FAQ Metallurgy JEE

Conservation of Biodiversity – Definition, Methods, Examples and Strategies

JEE Main Previous Year Papers Questions With Solutions Chemistry Nitro,Amine and Azo Compounds

Democratic Rights Class 9 Extra Questions Civics Chapter 6

Essay on All that Glitters is not Gold in English for Children and Students

Evans Tries an O-level Important Questions Class 12 English

Short and Long Essay on Corruption in English for Children and Students

Holi Wishes SMS and Messages for Mobile and Whatsapp