WorksheetsScientific Principles PPT 9 - Basic Principles of Electricity
Total questions: 18
Worksheet time: 9mins
What is the unit for electromotive force (emf)?
Ampere
Ohm
Volt
Watt
Which unit is used to measure current?
Volt
Ampere
Ohm
Joule
What does the ohm measure in electrical terms?
Voltage
Current
Resistance
Power
What happens when the voltage is increased in a conductor?
The resistance decreases
The current decreases
The force to cause electrons to flow increases
The conductor melts
What is the unit of power for an appliance?
Joules
Kilowatt hours
Watts
Volts
How is electricity consumption typically measured for billing purposes?
Watts
Joules
Kilowatt hours
Volts
What is the relationship between watts, amps, and volts in electrical principles?
Watts = Amps x Volts
Amps = Watts x Volts
Volts = Watts x Amps
Watts = Volts / Amps
If an appliance needs 3kW in a domestic property, what is the fuse size?
10 amp
12.5 amp
15 amp
20 amp
In a domestic property, an appliance has a fuse size of 3 amp. What is the maximum power rating of the appliance?
500w or 0.5kW
600w or 0.6kW
720w or 0.72kW
900w or 0.9kW
An appliance has a 5 amp fuse and needs 1.2kW of power. What is the voltage required?
220v
230v
240v
250v
What does Ohm's Law show the relationship between?
Voltage, current, and resistance
Power, energy, and time
Force, mass, and acceleration
Speed, distance, and time
What would be the resistance of a domestic appliance if the fuse size was 3 amp?
60 ohms
70 ohms
80 ohms
90 ohms
What is the fuse size for a domestic appliance which has 1,200 ohms resistance?
0.1 amp
0.2 amp
0.3 amp
0.4 amp
If an appliance had a fuse rated at 13 amp and the resistance was 32 ohms, what would the voltage be?
415v
400v
390v
380v
What does "AC" stand for in the context of electricity?
Alternating Current
Direct Current
Active Current
Analog Current
What does DC stand for in the context of electricity?
Direct current
Dynamic current
Dual current
Dispersed current
In a chemical battery, what happens to the cathode?
It dissolves in the solution
It eats away the anode
It becomes positively charged
It remains unchanged
What type of metals are used in a dilute acid solution in a battery?
Similar metals
Dissimilar metals
Non-metallic elements
Precious metals
