A relay coil has 500 ohms resistance, and...

Question 1 / 204cXLlg8jiiyd89DsrHKW

Question 1 of 204cXLlg8jiiyd89DsrHKW

A relay coil has 500 ohms resistance, and operates on 125 mA. What value of resistance should be connected in series with it to operate from 110 V DC?

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Question 1 of 20

4cXLlg8jiiyd89DsrHKW

A relay coil has 500 ohms resistance, and operates on 125 mA. What value of resistance should be connected in series with it to operate from 110 V DC?

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🔍 Key Concepts

• Ohm's Law: V = I × R • Series circuits: voltage drops add while current is the same through all components • Calculating required series resistance to drop excess voltage at a known current

💭 Think About

• First, find how much voltage is actually dropped across the relay coil at its operating current. Then, determine how much voltage still needs to be dropped by the series resistor when using a 110 V supply. • Once you know the voltage that must be dropped by the series resistor and the current through the circuit, use Ohm's Law to find the resistance needed. • Compare your calculated resistance to the answer choices and see which is closest to your result.

✅ Before You Answer

• Compute the relay coil’s voltage using V = I × R with the given resistance and current. • Subtract the relay’s voltage from 110 V to find the voltage required across the series resistor. • Use R = V / I for the series resistor, making sure the current is in amperes, not milliamps.

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Question 1 of 20

A relay coil has 500 ohms resistance, and operates on 125 mA. What value of resistance should be connected in series with it to operate from 110 V DC?

150 ohms.

220 ohms.

380 ohms.

470 ohms.

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Question 1 / 204cXLlg8jiiyd89DsrHKW

Question 1 of 204cXLlg8jiiyd89DsrHKW

A relay coil has 500 ohms resistance, and operates on 125 mA. What value of resistance should be connected in series with it to operate from 110 V DC?

Back

Question 1 of 20

4cXLlg8jiiyd89DsrHKW

A relay coil has 500 ohms resistance, and operates on 125 mA. What value of resistance should be connected in series with it to operate from 110 V DC?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed