A current of \(0·15\,A\) flows through a torch bulb for \(50 s.\) What is the total charge that has passed through the bulb in this time?
\[7·5 C\]
\[50·15 C\]
\[333 C\]
A switch is closed for three minutes and a total charge of \( 9 C\) flows through the circuit. What was the average current in the circuit?
\[20 A\]
\[3 A\]
\[0·05 A\]
Which statement applies to the following circuit when the switch is closed?
The circuit will work
The circuit will not work because there is no source of energy
The circuit will not work because there is a short circuit
What is the frequency of the UK mains supply?
\[50 Hz\]
\[60 Hz\]
\[110 Hz\]
What is a good source of d.c. electricity?
A mains socket in a house
A battery
A generator
What kind of electrical signal does this diagram show?
a.c.
d.c.
Neither
What is the declared value of the mains supply in the UK?
\[50 V\]
\[230 V\]
\[240 V\]
A negatively charged particle is placed between two parallel metal plates connected to a dc supply. When the circuit is completed, what happens to the particle?
Nothing, the charge is unaffected
The charge accelerates to the right
The charge accelerates to the left