AQA Physics Electricity and Core Practicals

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Questions and Answers

Which one of the following statements about current in a series circuit is correct?

The current is inversely proportional to the resistance

The current is the same at all points in the circuit (correct)

The current is directly proportional to the potential difference

The current is different at different points in the circuit

Which one of the following statements about potential difference in a parallel circuit is correct?

The potential difference is different across each branch

The potential difference is inversely proportional to the resistance

The potential difference is the same across all branches (correct)

The potential difference is directly proportional to the current

Which one of the following statements about resistance in a series circuit is correct?

The total resistance is the sum of the individual resistances (correct)

The total resistance is the average of the individual resistances

The total resistance is the difference of the individual resistances

The total resistance is the product of the individual resistances

Which of the following is true about current in a series circuit?

The current is the same at all points in the circuit Signup and view all the answers

In a parallel circuit, which of the following is true about the potential difference?

The potential difference is the same in each branch Signup and view all the answers

How is energy related to power and time?

Energy = power * time Signup and view all the answers

Which component of the CPU is responsible for coordinating the fetch execute cycle?

Control unit Signup and view all the answers

What determines how frequently the fetch execute cycle is carried out in a CPU?

Clock speed Signup and view all the answers

Which type of storage is slower than RAM but provides long-term storage?

Hard disk drives (HDDs) Signup and view all the answers

Which type of storage is volatile and loses data when power is turned off?

RAM Signup and view all the answers

What are binary units used for in representing and storing data?

Representing and storing data Signup and view all the answers

Which of the following accurately describes the concept of binary shifts?

Binary shifts involve adding or removing digits, with a left shift doubling the number and a right shift halving the number. Signup and view all the answers

What is the purpose of character sets like ASCII and Unicode?

Character sets allocate binary numbers to represent characters, with Unicode allowing for a larger number of characters than ASCII. Signup and view all the answers

What does the term 'resolution' refer to in the context of images?

Resolution refers to the number of pixels in an image, determining the size and clarity of the image. Signup and view all the answers

What does the term 'color depth' refer to in the context of images?

Color depth refers to the number of bits allocated to each pixel in an image, determining the range of colors that can be represented. Signup and view all the answers

What is the function of bandwidth in a network?

Bandwidth refers to the maximum amount of data that can be transferred at any given time on a network, and sharing bandwidth among devices can slow down transmission. Signup and view all the answers

Study Notes

Computer Systems and Networks: Key Concepts and Attacks

Binary addition follows the same rules as normal addition, but with the addition of carrying a 1 to the next column when necessary.
Binary shifts involve either adding or removing digits. A left shift doubles the number, while a right shift halves the number.
Overflow errors occur when the result of an operation takes up more storage space than is available, resulting in a wrong version of the number being stored.
Character sets, such as ASCII and Unicode, allocate binary numbers to represent characters, with Unicode allowing for a larger number of characters.
Images are represented as pixels, and the resolution of an image refers to the number of pixels it contains.
Color depth refers to the number of bits allocated to each pixel in an image, and metadata is stored to provide additional details about the image.
Sound is converted from analog to digital by taking samples of the amplitude at regular time intervals, with the sample rate determining the number of samples per second.
Bandwidth refers to the maximum amount of data that can be transferred at any given time on a network, and sharing bandwidth among devices can slow down transmission.
Local Area Networks (LANs) cover a small area, while Wide Area Networks (WANs) cover a larger area and often have infrastructure owned by multiple entities.
In client-server networks, devices take on the roles of either a client or a server, with the server responding to client requests. In peer-to-peer networks, devices can act as both clients and servers.
Network topologies include star (reliant on a central device) and mesh (direct connections to every device), each with their own advantages and disadvantages.
Protocols are a set of rules enabling devices to communicate, and TCP splits data into packets, while POP, IMAP, and SMTP are email protocols.Multitasking and Memory Management in Operating Systems
Operating systems support multitasking, which allows for the execution of multiple programs simultaneously.
Multitasking involves rapidly switching between the programs being executed.
The operating system determines when to move data across memory and when to delete data from RAM.
Memory management is a crucial function of the operating system.
RAM (Random Access Memory) is a type of memory used by the operating system to store program instructions and data.
The operating system decides which tasks should be executed based on priority and resource availability.
Multitasking creates the illusion of multiple tasks happening at once, even though they are rapidly switched between.
Peripherals are external devices connected to the computer, such as keyboards, mice, and printers.
Peripherals are managed by the operating system.
The operating system handles the communication between the peripherals and the computer.
The operating system ensures that the peripherals function properly and interact with the computer as intended.
Multitasking and memory management are essential for efficient and effective computer operation.

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Test your knowledge of AQA Physics Electricity and its core practicals with this quiz. Learn circuit symbols and more in this essential topic for exam success.