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The symbols for two electrical meters are given in the diagram - Junior Cycle Science - Question b - 2007
Question b
The symbols for two electrical meters are given in the diagram. The symbol A is for a meter that measures potential difference, often called 'voltage'. What elect... show full transcript
Worked Solution & Example Answer:The symbols for two electrical meters are given in the diagram - Junior Cycle Science - Question b - 2007
Step 1
Step 2
Enter 'A' into the appropriate circle of one of the meter symbols in the circuit diagram so as to clearly identify its correct position.
Answer
In the circuit diagram, the meter with the symbol A should be placed in series with the resistor R and the battery to measure the current flowing through the circuit.
Step 3
Use this graph to calculate the resistance of resistor R shown in the diagram. Give the unit of resistance with your answer.
Answer
To calculate the resistance R using the graph, select two points on the line. For example, let’s choose the points (0.1 A, 1 V) and (0.3 A, 3 V).
The resistance can be calculated using Ohm's Law:
Using the selected points:
- From (0.1 A, 1 V):
- From (0.3 A, 3 V):
Both calculations give the same resistance, confirming consistency in the measurements.
The unit of resistance is Ohms (Ω).