Old City & Guilds Current Limitation Question

  • Thread starter Thread starter Abbsdad
  • Start date Start date
  • Tags Tags
    Current
AI Thread Summary
The discussion revolves around a question from an old City & Guilds paper regarding a resistive load rated at 65 W and 110 V, intended for use on a 230 V supply. Participants seek assistance in calculating the current in the load, the necessary voltage drop across a series inductor, the inductor's inductance, and the circuit's phase angle. Additionally, they inquire about the advantages of current limitation and practical examples. There is a request for reading materials related to this topic, as existing resources primarily focus on MCBs and fuses. The conversation highlights the need for educational resources on electrical impedance and AC circuit analysis.
Abbsdad
Messages
2
Reaction score
0
Hi, I have the following question from an old City & Guilds paper:
A resistive load rated at 65 W, 110 V is to be used on a 230 V, 50 Hz supply.
Calculate
(a) current in the load
(b) voltage drop needed across a pure inductor connected in series with the load
(c) inductance of this inductor
(d) phase angle of the circuit
(e) explain the advantage of this type of current limitation and give one practical example.
Could someone point me to any reading material on this please as I can only find items relating to MCBs and fuses.
Many thanks.
 
Engineering news on Phys.org
What's an "old City & Guilds paper"? Is this question for schoolwork?
 

Thread 'Underwater piezoelectric sensor array receive sensitivity'

Hi all I have some confusion about piezoelectrical sensors combination. If i have three acoustic piezoelectrical sensors (with same receive sensitivity in dB ref V/1uPa) placed at specific distance, these sensors receive acoustic signal from a sound source placed at far field distance (Plane Wave) and from broadside. I receive output of these sensors through individual preamplifiers, add them through hardware like summer circuit adder or in software after digitization and in this way got an...
View full post »

Thread 'Following up on the recent thread about Earth Resistance measurements'

I have recently moved into a new (rather ancient) house and had a few trips of my Residual Current breaker. I dug out my old Socket tester which tell me the three pins are correct. But then the Red warning light tells me my socket(s) fail the loop test. I never had this before but my last house had an overhead supply with no Earth from the company. The tester said "get this checked" and the man said the (high but not ridiculous) earth resistance was acceptable. I stuck a new copper earth...
View full post »
Thread 'Electromagnet magnetic field issue'

Thread 'Electromagnet magnetic field issue'

Hi Guys We are a bunch a mechanical engineers trying to build a simple electromagnet. Our design is based on a very similar magnet. However, our version is about 10 times less magnetic and we are wondering why. Our coil has exactly same length, same number of layers and turns. What is possibly wrong? PIN and bracket are made of iron and are in electrical contact, exactly like the reference design. Any help will be appreciated. Thanks. edit: even same wire diameter and coil was wounded by a...
View full post »

Similar threads

Need help with a parallel inductance calculation for this transformer
Replies
2
Views
2K
Induction motor windings, number of turns per phase and per pole
Replies
2
Views
3K
Query about the time average of an AC power supply
Replies
2
Views
2K
ABC reference frame synchronous generator modelling in Ltspice
Replies
1
Views
3K
Voltage Drop in Parallel Receptacle Wiring
Replies
9
Views
2K
Cortex M4 sinking a lot of current
Replies
3
Views
2K
Asynchronous Motor Starting: Understanding the Initial Current Flow
Replies
12
Views
4K
Basic question about RLC circuits
Replies
32
Views
2K
Frequency Question -- 24 VAC, 60 Hz versus 24 VAC, 20 Hz
Replies
12
Views
3K
Transformer currents in primary and secondary question
Replies
1
Views
3K

Hot Threads

Recent Insights

Back
Top