9J Flashcards
What is the value of Earth’s gravity?
10 N/kg
True or False: Opposites attract and like charges repel.
True
What charge does the nucleus of an atom have?
Positive charge
What charge do electrons have?
Negative charge
What happens to the number of positive and negative charges in an atom?
They are equal, balancing out to give the atom no overall charge
What occurs when a material is rubbed?
Electrons are transferred from one material to another
What charge does the material that gains electrons have?
Negative charge
What charge does the material that loses electrons have?
Positive charge
What is a rule of current in a series circuit?
Current is the same everywhere
What happens to voltage in a series circuit?
Voltage is divided between components
What happens to current at junctions in parallel circuits?
Current splits up
What is the role of a cell in a circuit?
It pushes current around the circuit
What defines a series circuit?
It has all components in one loop
What is the function of a switch in a circuit?
It makes a gap in the circuit
What is an ammeter used for?
To measure the size of a current
How does wire thickness affect resistance?
The thicker the wire, the lower the resistance
How does wire length affect resistance?
The longer the wire, the higher the resistance
What is the unit of voltage?
Volts (V)
What is the unit of current?
Amps (A)
What is the unit of resistance?
Ohms (Ω)
Fill in the blank: Weight = mass x _______.
gravity
Fill in the blank: Power = voltage x _______.
current
Fill in the blank: Resistance = voltage/_______.
current
What is a force field?
Space where a non-contact force has an effect
