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WorksheetsELECTRICITY-02A_Electrical Components
Total questions: 17
Worksheet time: 36mins
A student investigates the resistance of a lamp. The student uses a circuit that contains an ammeter, a battery, a lamp, and a voltmeter to determine the resistance of the lap.
Draw a circuit diagram to show how he should connect the apparatus.
State the relationship between voltage, current, and resistance.
(a)
Calculate the resistance of the lamp when the voltage is 6.0 V. Give the appropriate unit.
(a)
The student reverses the battery connections and then repeats his measurements. On the axes below, sketch the graph that he would obtain. Part of the graph has been done for you.
A student investigates how the resistance of a wire depends on its length. The photograph shows the circuit that the student uses.
Draw a circuit diagram to show how the components in the photograph are connected.
Which one is the independent variable of this investigation?
the length of the wire
the material of the wire
the number of the battery
the current measured
Which one of these variables is the dependent variable of the investigation?
the current measured
the length of the wire
the number of the battery
the material of the wire
For 100 cm wire, the resistance of wire is ... Ohm. Round your answer up to 1 decimal.
(a)
From the datas, draw the graph.
The student replaces the filament lamp with a light emitting diode (LED). He notices that there is no current in the diode when the battery is reversed. He replaces the battery with an A.C. supply. Which graph shows how the current in diode varies with time?
Double insulation is needed for safety when there is
no circuit breaker
no earth connection
no fuse
no switch
A fuse is used so that
an earth connection is not needed
the appliances are more efficient
the circuit cannot overheat if there is a fault
the user cannot touch live wire
Most lamps at home have their own switch. This is because the lamps are connected
in parallel
in series
to a fuse
to an earth wire
These are the characteristics of a circuit.
(1) all the elements can be switched separately.
(2) To turn on all the elements, it only need single switch
(3) When 1 elements off, the others stay on.
(4) When 1 elements off, the others will be off.
(5) The current flow through the component is the same.
(6) the voltage across the component is the same.
Which are the characteristics of parallel circuit?
(1), (3), (5)
(1), (2), (3), and (4)
(2), (3), and (5)
(1), (3), (4), and (6)
(2), (4), and (6)
These are the characteristics of a circuit.
(1) all the elements can be switched separately.
(2) To turn on all the elements, it only need single switch
(3) When 1 elements off, the others stay on.
(4) When 1 elements off, the others will be off.
(5) The current flow through the component is the same.
(6) the voltage across the component is the same.
Which are the characteristics of series circuit?
(1), (3), (5)
(1), (2), (3), and (4)
(2), (3), and (5)
(1), (3), (4), and (6)
(2), (4), and (6)
A label on one of the office computers include this information. The current in the computer is ... A. State your answer up to 1 decimal place.
(a)
Suggest the most suitable fuse value for this device.
1 A
3 A
10 A
13 A
Some circuits use a circuit breaker instead of a fuse. State two advantages of using a circuit breaker instead of a fuse.
Which is the correct graph for a fixed resistor?
The diagram shows some electrical circuit symbols. Which symbol represents a switch?
(a)
The diagram shows some electrical circuit symbols. Which symbol represents a diode?
(a)
The diagram shows some electrical circuit symbols. Which symbol represents a lamp?
(a)
The diagram shows some electrical circuit symbols. Which symbol represents a variable resistor?
(a)
The hairdryer has a plastic case so there is no need for an earth wire connection in the plug. Explain why the hairdryer is still safe to use.
