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15 questions
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- Multiple ChoicePlease save your changes before editing any questions.
What is current?
the amount of charge
the amount of energy per unit charge
the work done to drive a charge through a component
the rate of flow of charge
- Multiple ChoicePlease save your changes before editing any questions.
What is potential difference?
the amount of charge
the rate of flow off charge
the work done to drive a charge through a component
the work done to drive a charge through a complete circuit
- Multiple ChoicePlease save your changes before editing any questions.
What is electromotive force (emf)?
the amount of charge
the rate of flow off charge
the work done to drive a charge through a component
the work done to drive a charge through a complete circuit
- Multiple ChoicePlease save your changes before editing any questions.
What is the unit of current?
C
A
V
Ω
- Multiple ChoicePlease save your changes before editing any questions.
What is the unit of potential difference?
C
A
V
Ω
- Multiple ChoicePlease save your changes before editing any questions.
What is the direction of conventional current flow?
from positive terminal to negative terminal of battery
from negative terminal to positive terminal of battery
- Multiple ChoicePlease save your changes before editing any questions.
What is the direction of electron flow in a circuit?
from positive terminal to negative terminal of battery
from negative terminal to positive terminal of battery
- Multiple ChoicePlease save your changes before editing any questions.
What is the definition of the resistance of a component?
the ratio of the potential difference across it to the current flowing through it
how much it opposes current
the ratio of the current flowing through it to the potential difference across it
the product of the current flowing through it and the potential difference across it
- Multiple ChoicePlease save your changes before editing any questions.
A 10 V appliance has a current of 2 A flowing through it. What is the resistance of the appliance?
0.2 Ω
5 Ω
10 Ω
20 Ω
- Multiple ChoicePlease save your changes before editing any questions.
Adding more bulbs in series, will make each bulb
brighter
dimmer
- Multiple ChoicePlease save your changes before editing any questions.
This is the symbol for a...
switch
Fixed Resistor
Variable Resistor
Fuse
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following does not use a variable resistor?
dimmer in lighting
speed control of a fan
speed control of a car
temperature control of an electric iron
- Multiple ChoicePlease save your changes before editing any questions.
Electroplating is an example of which effect of electric current?
heating effect
chemical effect
magnetic effect
none of the above
- Multiple ChoicePlease save your changes before editing any questions.
Which is an example of safe use of electricity?
overloading electrical sockets
using electrical appliances with frayed wires
drying your hands before using electrical appliances
pushing a pen into an electrical socket
- Multiple ChoicePlease save your changes before editing any questions.
A household uses a 2 kW appliance for 1 hour each day for 30 days. 1 kWh of energy costs $0.30. How much does it cost to use the appliance for 30 days?
$6
$18
$60
$180