please check my answers.
when a lamp is plugged into a 120 V socket, each coulomb of charge that flows in the circuit is raised to a potential engergy of 120 joules?
which offers more resistance to water flow, a wide pipe or narrow pipe? I got wide as my answer.
Similarly which offers more resistance to the flow of charge, a thick wire or a thin wire? I got thin wire as my answer.
If the filliament resistance in an automobile headlamp is 3 ohms, how many amps does it draw when connected to a 12 volt battery? I got 36 watts?
1. Correct
2. No to your pipe answer
3. They are asking for current (in amps), not power (in watts).
Use ohm's law.
Let's check your answers step-by-step:
1. For the statement "when a lamp is plugged into a 120 V socket, each coulomb of charge that flows in the circuit is raised to a potential energy of 120 joules," this is not correct. The potential energy can be calculated using the formula: potential energy = charge * voltage. In this case, potential energy = 1 coulomb * 120 volts = 120 joules. So, the potential energy for each coulomb of charge is 120 joules, not 120 volts. Therefore, your answer is incorrect.
2. For the question "which offers more resistance to water flow, a wide pipe or a narrow pipe?" you answered "wide pipe." This is incorrect. A narrow pipe offers more resistance to water flow because the smaller cross-sectional area restricts the flow of water. So, your answer is incorrect.
3. For the question "which offers more resistance to the flow of charge, a thick wire or a thin wire?" you answered "thin wire." This is correct. A thinner wire offers more resistance to the flow of charge because the smaller cross-sectional area restricts the flow of electric current. So, your answer is correct.
4. For the question "If the filament resistance in an automobile headlamp is 3 ohms, how many amps does it draw when connected to a 12-volt battery?" you answered "36 watts." This is incorrect. To calculate the current, you can use Ohm's Law: current (in amperes) = voltage (in volts) / resistance (in ohms). Plugging in the values, we have current = 12 volts / 3 ohms = 4 amperes. So, the headlamp draws 4 amps of current when connected to a 12-volt battery, not 36 watts. Therefore, your answer is incorrect.
Please note that it's important to double-check your calculations and use the correct formulas to arrive at the correct answers.
Let's go through each of your answers one by one.
1. When a lamp is plugged into a 120 V socket, each coulomb of charge that flows in the circuit is raised to a potential energy of 120 joules.
Your answer is incorrect. The potential energy of a coulomb of charge is given by the product of the voltage and the charge. So, in this case, if the lamp is plugged into a 120 V socket, each coulomb of charge that flows in the circuit has a potential energy of 120 joules.
2. Which offers more resistance to water flow, a wide pipe or a narrow pipe?
Your answer is correct. A narrow pipe offers more resistance to water flow compared to a wide pipe. This is because water has less space to flow through in a narrow pipe, causing the flow to be restricted and creating more resistance.
3. Similarly, which offers more resistance to the flow of charge, a thick wire or a thin wire?
Your answer is incorrect. A thick wire offers less resistance to the flow of charge compared to a thin wire. According to Ohm's Law, the resistance of a wire is inversely proportional to its cross-sectional area. So, a thick wire has a larger cross-sectional area and thus lower resistance compared to a thin wire.
4. If the filament resistance in an automobile headlamp is 3 ohms, how many amps does it draw when connected to a 12-volt battery?
Your answer is incorrect. To calculate the current, you can use Ohm's Law, which states that current (I) is equal to the voltage (V) divided by the resistance (R). In this case, the voltage is 12 volts and the resistance is 3 ohms, so the current is given by I = V/R = 12 V / 3 Ω = 4 amps. Therefore, the headlamp draws 4 amps from the 12-volt battery.
I hope this helps clarify your answers. Let me know if you have any more questions!