A student set up the circuit shown to investigate the magnetic effect of a constant electric current - Junior Cycle Science - Question 9 - 2015
Question 9
A student set up the circuit shown to investigate the magnetic effect of a constant electric current. She varied the number of turns of wire in the coil and counted ... show full transcript
Worked Solution & Example Answer:A student set up the circuit shown to investigate the magnetic effect of a constant electric current - Junior Cycle Science - Question 9 - 2015
Step 1
Name a suitable material from which the bar and the paper-clips should be made.
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Answer
Iron, nickel, steel, or cobalt are suitable materials due to their ferromagnetic properties.
Step 2
Name the instrument labelled A in the circuit diagram. What does this instrument measure?
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Answer
The instrument labelled A is an ammeter, which measures electric current.
Step 3
Draw a graph in the grid below of the number of paper-clips picked up versus the number of turns of wire in the coil.
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Answer
Plot the points based on the table: (20, 5), (40, 11), (60, 16), (80, 20), (100, 26). Ensure the graph is accurately plotted with a line of best fit.
Step 4
Use your graph to estimate how many paper-clips would be picked up if there were 30 turns of wire in the coil.
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Answer
From the graph, estimate that approximately 8 paper-clips would be picked up with 30 turns of wire in the coil.
Step 5
State one way in which the student might have made sure that this investigation was a fair one.
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One way to ensure a fair investigation is to use the same size and mass of paper clips for each trial.
Step 6
What is direct current?
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Direct current (d.c.) is the flow of electric charge in one direction only.
Step 7
The other type of electric current is supplied to our homes by electricity suppliers. Name this type of electric current.
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This type of electric current is known as alternating current (a.c.).
Step 8
What is the main energy conversion happening when a mobile phone is being recharged?
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The main energy conversion is from electrical energy to chemical energy.
Step 9
Draw two bulbs in series.
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Answer
A drawing showing two bulbs connected end-to-end with a single path for current.
Step 10
Draw two bulbs in parallel.
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A drawing showing two bulbs connected side-by-side with separate paths for current.
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