Physics for IGCSE & O level - Electricity (Section 10)
1
Which of the following formulas can be used to calculate combined resistance of two resistors in parallel?
2
Which component in a circuit resists the flow of electrons?
3
In a parallel circuit, if one branch is open (broken), what happens to the other branches?
תְשׁוּבָה(B)
They continue to function.
4
Which of these materials is a semiconductor?
5
If the resistance in a circuit increases, what happens to the current (assuming voltage remains constant)?
6
What happens to the current in a series circuit if you increase the resistance?
7
What happens when resistors are in parallel?
8
If the diameter of a wire is increased, what happens to its resistance, assuming length and material remain the same?
9
If you increase the voltage across a fixed resistor, what happens to the current?
10
Which of the following would typically be found in a household circuit?
11
Which of these is a safety measure for a UK plug?
12
What type of component is commonly used to step up or step down voltage?
13
Which of the following are measured in amperes?
14
Which safety device protects against the risk of electrocution?
15
What safety device is designed to immediately cut off the power in the event of a fault?
16
What does a light-dependent resistor (LDR) do?
תְשׁוּבָה(B)
Varies resistance based on light.
17
Which quantity is measured in watts?
18
Which of these has a high resistance?
19
If you have a 12V battery and two 6-ohm resistors in series, what is the total resistance?
20
Which of the following materials would likely be the *least* resistant conductor?
21
What is the purpose of a fuse in an electrical circuit?
22
Which wire in a standard UK three-pin plug is used to connect the appliance to the earth?
23
In a parallel circuit, what happens if one branch is open (broken)?
תְשׁוּבָה(D)
The other branches continue to function.
24
Which of the following is measured in Volts?
25
What is the relationship between the voltage, current, and resistance (Ohm's Law)?
תְשׁוּבָה(C)
Voltage = Current * Resistance
26
How do electrons move in a conductor when connected in a circuit?
תְשׁוּבָה(C)
Towards the positive terminal
28
Which factors affect the resistance of a wire?
29
In series circuits, how does the current compare across the components?
תְשׁוּבָה(B)
The same for each component
30
What is the formula for Ohm's Law?
31
What type of resistor is affected by light?
32
What is the purpose of a switch in a circuit?
תְשׁוּבָה(C)
To control the flow of current
33
Which of the following components is a semiconductor device?
34
Which factors affect the force between charges?
35
Which of the following is a source of electrical energy?
36
Which of the following components is designed to provide a specific amount of resistance?
37
How is the current measured in a circuit?
תְשׁוּבָה(C)
Using an ammeter in series.
38
What is the relationship between charge, current, and time?
39
Which of the following formulas represents the electrical power equation?
40
If the voltage in a circuit is doubled, what happens to the current (assuming resistance remains constant)?
41
What kind of relationship is there between the resistance and the area?
42
What is the role of the earth wire in a household electrical system?
תְשׁוּבָה(B)
To provide a low-resistance path to ground
43
What happens to the resistance of a metallic conductor as its temperature decreases?
44
What is the effect of having more cells (batteries) connected in series?
45
What type of resistor has a resistance that decreases when light shines on it?
46
Which of the following is a good conductor of electricity?
47
What is the relationship between the resistance and the material of the conductor?
48
What are the parts of atom?
49
What does the symbol 'V' stand for in the context of electricity?
50
In a series circuit, what is the total resistance equal to?
תְשׁוּבָה(A)
The sum of the individual resistances
