Wireless transmission

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Date:

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Quick Questions

Shade in the A or B circle for each question.

1. How does wireless transmission carry data between devices?

A Through cables plugged into each device

B As radio signals through the air

2. Which of these is an example of wireless transmission?

A Wi-Fi

B An Ethernet cable

3. A phone uses mobile data to load a video while you are out walking. How is the data sent?

A Wirelessly, as radio signals

B Through a cable under your feet

4. Which wireless connection is usually used for short-range transfers, like wireless headphones to a phone?

A Bluetooth

B Mobile data

5. You walk far away from the Wi-Fi router and the signal gets weak. What is the most likely reason?

A The radio signals turned into cables

B You are moving out of range

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1Wi-Fi		AWireless connection that uses short-range radio signals to send data between nearby devices
2Bluetooth		Brange
3Data can travel wirelessly over a mobile phone network when you are away from Wi-Fi		CWireless transmission uses no cables. Data travels as radio signals through the air, not through cables.
4The signal gets weaker the further a device moves from the wireless source		Dmobile data
5Wireless data travels through cables hidden in the air		EInterference from other devices, like microwaves or other wireless networks, can weaken or disrupt a wireless signal.
6Other devices can never affect a Wi-Fi signal		FWireless connection that uses radio signals to link devices to a router or access point in a local area

Definitions

wireless transmission

Fill in the Blanks

Complete each line of code by filling in the missing parts.

wireless data travels as _____ signals in air

Wi-Fi connects a device to a ______

_________ sends data a short range, like to earbuds

mobile data links a phone to a cell _____

walls and other devices can cause ____________

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A connection = 'Wi-Fi'

B medium = 'copper cables'

C print(connection, medium)

Question 2

A def send_wireless(data):

B signal = radio(data

C return signal

Question 3

A wifi = 'on'

B if wifi = 'on':

C print('Online')

Question 4

A nets = ['Wi-Fi', '4G']

B for n in nets:

C print(n, 'uses radio')

D print('Cables are needed')

Question 5

A signal = 90

B walls = 3

C signal = signal + walls * 10

D print(signal)

Answer Key

Wireless transmission

Section A: Quick Questions

B — As radio signals through the air

A — Wi-Fi

A — Wirelessly, as radio signals

A — Bluetooth

B — You are moving out of range

Section B: Match the Pairs

Wi-Fi → Wireless connection that uses radio signals to link devices to a router or access point in a local area

Bluetooth → Wireless connection that uses short-range radio signals to send data between nearby devices

Data can travel wirelessly over a mobile phone network when you are away from Wi-Fi → mobile data

The signal gets weaker the further a device moves from the wireless source → range

Wireless data travels through cables hidden in the air → Wireless transmission uses no cables. Data travels as radio signals through the air, not through cables.

Other devices can never affect a Wi-Fi signal → Interference from other devices, like microwaves or other wireless networks, can weaken or disrupt a wireless signal.

Section C: Definitions

wireless transmission — Sending data as radio signals through the air with no cables, like Wi-Fi, Bluetooth and mobile data. Range and interference can weaken the signal.

Section D: Fill in the Blanks

wireless data travels as radio signals in air

Wi-Fi connects a device to a router

Bluetooth
 sends data a short range, like to earbuds

mobile data links a phone to a cell tower

walls and other devices can cause 
interference

Section E: Spot the Error

B — Wi-Fi is wireless, so it carries data as radio signals through the air, not through copper cables. The line should be medium = 'radio signals'.

B — The function call is missing its closing bracket. The line should be signal = radio(data).

B — A single = assigns a value, but an if statement needs == to compare. It should be if wifi == 'on':.

D — Wi-Fi and 4G are wireless connections that send data as radio signals, so no cables are needed. The line should be print('No cables needed').

C — Walls get in the way and weaken a wireless signal, so the signal strength should go down. It should be signal = signal - walls * 10.