This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.

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0.4 A
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Question 7.7: A bulb operates from a 220 V supply. The resistance is 550 Ω. Calculate the strength of the current when it is lit.
Step 1: Identify the given values. Voltage () = Resistance () =
Step 2: Use Ohm's Law to calculate the current (). The strength of the current is 0.4 A.
Question 7.8: An electronic circuit needs a potential difference of 3.6 V across a resistor when it has a current of 30 mA. Will the voltage still be 3.6 V if the resistor has a resistance of 96 Ω? Answer Yes or No. Justify your response with a calculation.
Step 1: Identify the given values for the new scenario. Current () = Resistance () =
Step 2: Convert the current from milliamperes (mA) to amperes (A).
Step 3: Calculate the voltage () across the resistor using Ohm's Law ().
Step 4: Compare the calculated voltage to the required voltage of 3.6 V. Since , the voltage will not still be 3.6 V.
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Okay, Success💗🎀🥹, let's continue with these circuit problems. Question 7.7: A bulb operates from a 220 V supply.
This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.