The smart way to improve grades

Comprehensive & curriculum aligned

Affordable pricing from £10/month

Gadgets

In this worksheet, students explore the science used behind gadgets.

Key stage:  KS 4

Curriculum topic:  Physics: Electricity

Curriculum subtopic:  Exploring Current, Resistance and Voltage Relationships

Difficulty level:  

NEW! Try our assessments with your £1 trial
down

Here's a preview of the tutorial worksheet your child will complete. Sign up to EdPlace and access 1000s of worksheets that are marked automatically. With an account you can track progress and measure results.

QUESTION 1 of 10

Here is some vocabulary for the electricity used in gadgets. Read it thoroughly, as you will need it to answer the questions in this worksheet:

  • Rheostat, a variable resistor, which controls the current flowing through it
  • Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage across the conductor
  • Non-ohmic conductors do not let current flow through them in proportion to the voltage across them
  • Two fixed resistors can be used to act as a potential divider, which produces the required voltage in a circuit
  • The resistance of a thermistor decreases as the temperature increases; they are used in fire alarms
  • LDRs are used to detect light levels in automatic security lights; their resistance decreases as light intensity increases
  • Transistors are electronic switches and they are widely used in computers
  • Logic gates are made of different combinations of transistors; the different combinations are shown on truth tables
  • LEDs light when the output current of a logic gate is high
  • A relay is a type of switch
  • A magnetic field is produced around a wire carrying electric current
  • A solenoid is a long piece of wire twisted into several coils
  • DC electric motors work with direct current
  • The dynamo effect is the generation of electricity by moving a wire near a magnet
  • A generator uses kinetic energy to produce electrical energy
  • A transformer is a device that changes the voltage
  • A diode only lets current flow in one direction

What does a rheostat do?

it splits up current

it controls current flowing through it

it works as a switch

What does Ohm's Law state?

the current flowing through a conductor is directly proportional to the voltage across the conductor squared

the current flowing through a conductor is inversely proportional to the voltage across the conductor

the current flowing through a conductor is directly proportional to the voltage across the conductor

How many fixed resistors can be used as a potential divider?

1

2

3

4

What happens to the resistance of a thermistor as the temperature increases?

increases

stays the same

decreases

What do LDRs detect?

light

sound

heat

What is a transistor?

electronic switch

light detector

controls current

Select the word from the options below which completes this sentence:


Logic gates are made of different combinations of _____________.

thermistors

rheostats

transistors

Where are the different combinations of transistors in logic gates shown?

in truth tables

in real tables

in fake tables

What type of energy does a generator use to produce electrical energy?

thermal (heat)

kinetic

sound

What does a transformer change?

current

voltage

charge

  • Question 1

What does a rheostat do?

CORRECT ANSWER
it controls current flowing through it
EDDIE SAYS
A rheostat controls current flowing through it.
  • Question 2

What does Ohm's Law state?

CORRECT ANSWER
the current flowing through a conductor is directly proportional to the voltage across the conductor
EDDIE SAYS
Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage across the conductor.
  • Question 3

How many fixed resistors can be used as a potential divider?

CORRECT ANSWER
2
EDDIE SAYS
Two fixed resistors can be used as a potential divider.
  • Question 4

What happens to the resistance of a thermistor as the temperature increases?

CORRECT ANSWER
decreases
EDDIE SAYS
The resistance of a thermistor decreases as the temperature increases.
  • Question 5

What do LDRs detect?

CORRECT ANSWER
light
EDDIE SAYS
LDRs detect light.
  • Question 6

What is a transistor?

CORRECT ANSWER
electronic switch
EDDIE SAYS
A transistor is an electronic switch.
  • Question 7

Select the word from the options below which completes this sentence:


Logic gates are made of different combinations of _____________.

CORRECT ANSWER
transistors
EDDIE SAYS
Logic gates are made of different combinations of transistors.
  • Question 8

Where are the different combinations of transistors in logic gates shown?

CORRECT ANSWER
in truth tables
EDDIE SAYS
The different combinations of transistors in logic gates are shown in truth tables.
  • Question 9

What type of energy does a generator use to produce electrical energy?

CORRECT ANSWER
kinetic
EDDIE SAYS
A generator uses kinetic energy to produce electrical energy.
  • Question 10

What does a transformer change?

CORRECT ANSWER
voltage
EDDIE SAYS
A transformer changes voltage.
Previous Next

Easy As 1-2-3

Have fun learning at home on our desktop website or on-the go with our app

Start your £1 trial today.

Terms apply