- #1

IronaSona

- 38

- 7

- Homework Statement
- .

- Relevant Equations
- XL =2p x f x L.

Hello, am kind of new to all the physics stuff , and kind a terrible at maths but am trying my best to be good at it one day .So i was told to answer this question

When a direct current of 2A is passed through a coil, the potential difference across the coil is 20V. When an alternating current of 2A at a frequency of 40Hz is passed through the coil, the potential difference across the coil is 140V.

a) Find the current in the coil if it is connected to a supply of 230V, 50Hz.

but i don't even know where i need to start ? do i need to find the coil inductances first and then do:

2 = a constant (2 x 3.1416 = 6.28)

6.28*hz*henries= ... Ohms

240V/...Ohms= ...Amps?

is that right ?and for (b) i got no idea how to do that

b) What is the phase shift of the current in the coil with respect to the supply voltage?

When a direct current of 2A is passed through a coil, the potential difference across the coil is 20V. When an alternating current of 2A at a frequency of 40Hz is passed through the coil, the potential difference across the coil is 140V.

a) Find the current in the coil if it is connected to a supply of 230V, 50Hz.

but i don't even know where i need to start ? do i need to find the coil inductances first and then do:

2 = a constant (2 x 3.1416 = 6.28)

6.28*hz*henries= ... Ohms

240V/...Ohms= ...Amps?

is that right ?and for (b) i got no idea how to do that

b) What is the phase shift of the current in the coil with respect to the supply voltage?

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