Vocabulary
This instrument detects and measures small electric currents.
What is a galvanometer?
An electromagnet is created when electric current flows through this.
What is a coil of wire?
The one variable deliberately changed during an experiment is called this.
What is the independent variable?
The rotating coil of wire inside an electric motor is called this.
What is the rotor?
For electromagnetic induction to occur, the magnetic field must be doing this.
What is changing?
This machine converts electrical energy into mechanical energy.
What is an electric motor?
This core material is commonly used to make an electromagnet stronger because its magnetic domains can align easily.
What is iron?
The variable measured as a result of the experiment is called this.
What is the dependent variable?
The surrounding permanent magnets or electromagnets in a motor are called this.
What is the stator?
A stationary magnet next to a stationary wire produces this amount of induced current.
What is no current?
This machine converts mechanical energy into electrical energy.
What is a generator?
Increasing this electrical quantity increases current and can make an electromagnet stronger.
What is voltage?
Variables that remain the same during an experiment are called these.
What are controlled variables?
This device reverses the current at the correct moment to keep the motor spinning.
What is the commutator?
Moving a magnet faster through a coil produces this effect on induced current.
What is a larger induced current?
This process occurs when a changing magnetic field produces an EMF or current in a conductor.
What is electromagnetic induction?
If the number of coil loops is doubled while other variables remain the same, this generally happens to magnetic field strength.
What is it increases (approximately doubles)?
Scientists should repeat an experiment at least this many times to improve accuracy and reduce error.
What are 3 trials?
The turning effect that causes the motor's coil to rotate is called this.
What is torque?
Increasing the number of loops in a generator coil generally causes this.
What is an increase in induced current/EMF?
This device uses two coils and electromagnetic induction to increase or decrease AC voltage.
What is a transformer?
Reversing the direction of current causes this part of the electromagnet to switch.
What are the magnetic poles/polarity?
A student changes the number of coil loops and measures how many paper clips are lifted. The paper clips lifted represent this type of variable.
What is the dependent variable?
According to Fleming's Left-Hand Rule, this finger represents the direction of motion or force.
What is the thumb?
If a galvanometer needle has a larger deflection, it indicates this.
What is a greater current (or larger EMF)?