WorksheetsF2 7.1 Electricity
Total questions: 20
Worksheet time: 11mins
A plastic strip was rubbed with cotton and became positively charged. The correct explanation for why the plastic strip becomes positively charged is that ...
the plastic strip gains extra protons from the cotton.
the plastic strip gains extra protons from the charging process
protons were created as the result of the charging process
the plastic strip lost electrons to the cotton during the charging process
Same charges _____ each other
repel
attract
Opposite charges _______ each other
repel
attract
The number of protons is more than the electrons.
Positively charged
Negatively charged
Neutral
The number of electrons is more than the protons
Positively charged
Negatively charged
Neutral
The number of protons and electrons is equal
Positively charged
Negatively charged
Neutral
An ____________ is a device used to detect the existence of
electric charges on an object.
microscope
electroscope
stethoscope
telescope
Lightning is a result of the force of attraction that exists between the ________ charges on the ground and the __________ charges in the clouds.
negative, positive
negative, neutral
positive, negative
positive, neutral
The lightning ___________ is installed at buildings to provide a path for the electric charges to flow into the ground.
insulator
metal
plastic
conductor
A potential difference of 24 V is applied to a resistor with 15 Ohms. How much current flows through the resistor?
0.15 A
1.5 A
0.16 A
1.6 A
What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?
25 V
10 V
2.5 V
0.4 V
Which word means ability to resist the flow of electrons?
Current
Voltage
Resistance
Power
What is current measured in?
Ω (Ohms)
V (Volts)
A (Ampere)
W (Watts)
Voltage is simply defined as...
potential difference between two points
what 'stops' electrons
moving electrons
Device used to measure electric current.
Voltmeter
Ammeter
Ohmeter
Switch
Formula for Ohm's Law.
I = VR
R = VI
V = IR
