chapter 5: Electrical Energy Test Flashcards
The unit used to measure electrical current is
amps (a)
The instrument used to measure voltage is called?
Volts (v)
A 5 Ohm resistor is replaced by 10 Ohm resistor. If the current flowing through the resistor remains the same, what has happened to the voltage drop across the resistor?
The current remains the same, voltage increases
The resistance of a component doubles in a circuit. If the supply voltage remains the same, predict what will happen to the current flowing through the component.
The current is divided across the circuit, current will increase
To light globes are attached in parallel with the battery. Another light globe is attached in parallel with the first two. What will happen to the brightness of the first two globes?
The brightness remains the same
The resistance of the wire does not depend on which of the following?
Length, thickness, material type
Which of the following materials is an insulator?
- Rubber
- Plastic
NOT metal
The colour of the active wire in an electrical cable is
red/ brown
Homes generally have a number of safety devices that minimise the chance of currents flowing where they shouldn’t. Which of the following needs to be replaced after it is used
Fuse or circuit breakers.
Specify the unit and unit symbol used to measure:
a) Current
b) Voltage
c) Resistance
a) amps (a)
b) volts (v)
c) ohms
Specify the fault is available from PowerPoints
240 volts
There’s three advantages are parallel circuits have over series circuits
- Easy to setup
- Current is the same in all parts
- OnePath breaks, others aren’t affected
series circuit
- components share voltage (splits)
- current stays the same
- one path
parallel circuit
- voltage spreads equally across paths, all get the same voltage
- current splits
