They can allow large current to be switched on and off in a circuit.
(They; can allow; large current to be switched on and off in a circuit) Context(They can allow,List([0, 14))):(large current; to be switched; L:in a circuit)
They can allow,List([0, 14))
They large current
can allow to be switched
large current to be switched on and off in a circuit
L:in a circuit