RMS Current Help: What is the Primary Coil's Current in a Transformer?

In summary, RMS current, also known as root mean square current, is the effective value of an AC current that takes into account both the magnitude and direction of the current. It is calculated by taking the square root of the mean of the squared values of the current over a specific time period and is important for measuring power consumption, determining wire size and safety devices, and ensuring electrical safety. The main difference between RMS current and average current is that RMS considers the direction of the current, making it a more accurate measure of power consumption. Exceeding the RMS current can result in hazards such as fires or electrical shocks, emphasizing the importance of using the correct RMS current rating for all electrical components.
  • #1
BuBbLeS01
602
0
RMS Current...HeLp!

Homework Statement


The primary coil of a transformer is connected to a 130 V/60 Hz wall outlet. The secondary coil is connected to a lamp that dissipates 64 W. What is the rms current in the primary coil?


Homework Equations





The Attempt at a Solution


I = P/V
but I don't have P for the primary
 
Physics news on Phys.org
  • #2
If the transformer is ideal then the power output is the same as the power input.
 
  • #3
So it is 64W??
 

FAQ: RMS Current Help: What is the Primary Coil's Current in a Transformer?

What is RMS current?

RMS current, also known as root mean square current, is the effective value of an AC current. It takes into account both the magnitude and direction of the current and is equivalent to the DC current that would produce the same amount of heat in a resistor.

How is RMS current calculated?

RMS current is calculated by taking the square root of the mean of the squared values of the current over a specific time period. This is done to account for the constantly changing direction of the AC current.

Why is RMS current important?

RMS current is important because it is used to measure the power consumption and load capacity of electrical systems. It also helps in determining the appropriate size of wires and safety devices for a given circuit.

What is the difference between RMS current and average current?

The main difference between RMS current and average current is that RMS takes into account the direction of the current, while average current does not. This makes RMS a more accurate measure of the actual power being consumed by an AC circuit.

How does RMS current affect electrical safety?

RMS current is used to determine the safe operating limits for electrical systems and devices. Exceeding the RMS current can result in overheating and potential hazards such as fires or electrical shocks. It is important to use the correct RMS current rating for all electrical components to ensure safety.

Similar threads

Calculating Current in Primary Coil: Where Does P = V^2/R Formula Come In?
Replies
8
Views
2K
Voltage in secondary coil of transformer
Replies
13
Views
3K
Solving for RMS current of a resistor, help?
Replies
6
Views
2K
What Current Flows in a Coil at 230V, 50Hz?
Replies
5
Views
2K
Transformer and power question mutiple choice
Replies
7
Views
1K
Inductive charging: Emf induced in two coil loops
Replies
4
Views
2K
Applying Ampere's Law to a Transformer
Replies
5
Views
3K
Calculate the RMS current of an ac circuit
Replies
3
Views
2K
Current Flowing through High Voltage AC Transmission Lines
Replies
8
Views
2K
RMS of square wave and alternating currents
Replies
2
Views
1K

Hot Threads

Recent Insights

Back
Top